Isabella Oliver Size Guide
About Isabella Oliver
Isabella Oliver is a premium maternity fashion brand dedicated to helping expectant mothers feel confident, stylish, and comfortable throughout their pregnancy journey. The brand's sizing philosophy is refreshingly straightforward: all maternity pieces are designed to match your pre-pregnancy clothing size, eliminating the confusion and guesswork that often comes with maternity wear. This thoughtful approach means if you were a UK size 12 before pregnancy, you'll simply order an Isabella Oliver size 3.
What sets Isabella Oliver apart is their commitment to flattering silhouettes through signature ruching and wrapping techniques, allowing garments to adapt beautifully at every stage of pregnancy. Their collections range from everyday essentials to occasion wear, all crafted in wearable, high-quality fabrics that are predominantly machine washable. The brand caters exclusively to pregnant women, offering a curated selection of dresses, tops, trousers, jeans, and even maternity bras that prioritise both style and comfort. Isabella Oliver is the choice for expectant mothers who refuse to compromise on fashion during pregnancy.
How to Measure
To find your correct Isabella Oliver size, you'll need to take accurate body measurements. Follow these steps carefully, using a soft measuring tape and wearing minimal clothing:
- Bust – Wearing a well-fitting bra, place the measuring tape around the fullest part of your bust, ensuring the tape sits straight across your back. Do not pull the tape too tightly; it should sit comfortably against your skin.
- Chest – Similar to bust measurement, this is taken around the fullest part of your chest area. This measurement helps determine overall fit for wrap and drape styles.
- Waist – Locate the slimmest part of your natural waistline, typically positioned above your naval and below your ribcage. Measure this circumference without pulling the tape tight.
- Hips – Place the tape around the fullest part of your hips, usually over your bottom or at the top of your thighs. Keep the tape level and parallel to the ground.
- Low Hip – Some Isabella Oliver pieces also reference a low hip measurement, taken approximately 20 centimetres below the natural waistline. This is particularly important for trousers and jeans fit.
- Arm Length – With a gentle, natural bend in your arm, place the measuring tape on your shoulder bone and measure over your elbow to your wrist. This ensures sleeves will hit at the correct length.
- Inside Leg (for trousers) – Measure from the top of your inner leg, at the crotch point, down to your ankle bone. This measurement is crucial for getting the correct trouser length.
Pro Tip: All measurements on Isabella Oliver product pages are based on their standard UK size 2 (UK size 10) customer, approximately 160–165 centimetres (5’4” to 5’6”) tall. If you are significantly taller or shorter, check individual product measurements before ordering to ensure proper length.
Isabella Oliver Maternity Clothing Size Chart
Isabella Oliver's maternity sizes are designed to correspond with your pre-pregnancy clothing size. Simply locate your usual size in the chart below and order the corresponding Isabella Oliver number.
| Isabella Oliver Size | UK Size | US Size | EU Size | Bust (cm) | Bust (in) | Waist (cm) | Waist (in) | Hip (cm) | Hip (in) |
|---|---|---|---|---|---|---|---|---|---|
| 0 | 4–6 | 0–2 | 32–34 | 81 | 32 | 65 | 25.5 | 92 | 36.25 |
| 1 | 8 | 4 | 36 | 83.5 | 33 | 67.5 | 26.5 | 94.5 | 37.25 |
| 2 | 10 | 6 | 38 | 86 | 34 | 70 | 27.5 | 97 | 38.25 |
| 3 | 12 | 8 | 40 | 91 | 35.75 | 75 | 29.5 | 102 | 40.25 |
| 4 | 14 | 10 | 42 | 96 | 37.75 | 80 | 31.5 | 107 | 42 |
| 5 | 16–18 | 12–14 | 44–46 | 101 | 39.75 | 85 | 33.5 | 112 | 44 |
| 6 | 20 | 16 | 48 | 108 | 42.5 | 92 | 36.25 | 119 | 47 |
Isabella Oliver Maternity Jeans Sizing Guide
Isabella Oliver jeans are an investment piece designed to flatter throughout your pregnancy. The jeans sizing uses a numeric system that correlates with pre-pregnancy sizes and traditional denim sizing.
| Isabella Oliver Size | UK Pre-pregnancy Size | Denim Size (Waist) |
|---|---|---|
| 1 | 8 | 25 |
| 2 | 10 | 27 |
| 3 | 12 | 29 |
| 4 | 14 | 31 |
| 5 | 16–18 | 33 |
| 6 | 20 | 35 |
About Isabella Oliver Jeans: These premium maternity jeans are crafted in wearable denim fabrics and feature multiple styling options including over-bump and under-bump styles. They are designed to grow with you throughout pregnancy while maintaining a flattering silhouette. Many customers find excellent resale value on pre-owned platforms, recovering 50–70% of the original purchase price.
Isabella Oliver Trousers Length Guide
Isabella Oliver offers two standard trouser lengths to accommodate different heights and preferences. All length options are available across the full size range.
| Trousers Length | Length (cm) | Length (inches) | Best For |
|---|---|---|---|
| Regular | 81 | 32 | Average height (approximately 5’4” to 5’7”) |
| Long | 86 | 34 | Taller customers (5’7” and above) |
Isabella Oliver Cake Maternity Bra Size Guide
Isabella Oliver's Cake maternity bra collection offers a range of band and cup sizes designed specifically for pregnant and nursing mothers. Bra sizing is independent of clothing size and should be determined by your actual chest and bust measurements.
| Band Size | Cup B | Cup C | Cup D | Cup DD | Cup E | Cup F |
|---|---|---|---|---|---|---|
| 32 | S | S | S | S | S | M |
| 34 | S | S | M | M | M | M |
| 36 | M | M | M | L | L | L |
| 38 | M | L | L | L | L | XL |
| 40 | L | L | XL | XL | XL | XL |
| 42 | XL | XL | XL | XL | XL | – |
About Isabella Oliver Bras: Cake maternity bras are engineered with comfort, support, and functionality for pregnancy and nursing in mind. Sizing is based on actual band and cup measurements and does not correspond to clothing sizes. We recommend measuring your underbust (for band size) and fullest bust (for cup size) to determine the correct fit.
Isabella Oliver Footwear Size Chart
Isabella Oliver occasionally offers footwear pieces that complement their maternity collections. Use the chart below to convert between UK, US, and EU shoe sizes.
| UK Size | US Women's Size | EU Size | Foot Length (cm) |
|---|---|---|---|
| 3 | 5 | 36 | 22.5 |
| 4 | 6 | 37 | 23.5 |
| 5 | 7 | 38 | 24 |
| 6 | 8 | 39 | 24.5 |
| 7 | 9 | 40 | 25.5 |
| 8 | 10 | 41 | 26.5 |
Maternity-Specific Size Guidance
Standard Pregnancy Sizing
Isabella Oliver's entire range is designed to accommodate normal pregnancy weight gain whilst maintaining a flattering silhouette. If you were a UK size 12 before pregnancy, you should order an Isabella Oliver size 3. The pieces feature strategic ruching and wrapping that adapts beautifully as your bump grows throughout the three trimesters.
Expecting Twins
If you are pregnant with twins, Isabella Oliver recommends going up one full size to account for additional weight gain and a larger bump. For example, if you were a UK size 12 (Isabella Oliver size 3) before pregnancy, you should order an Isabella Oliver size 4 instead. This ensures your maternity wardrobe will remain comfortable and flattering throughout a twin pregnancy.
Pre-Pregnancy vs. Maternity Sizing
One of Isabella Oliver's key differentiators is their straightforward pre-pregnancy sizing approach. Unlike many maternity brands that use confusing conversion systems, Isabella Oliver simply asks: "What size were you before pregnancy?" Your pre-pregnancy size becomes your Isabella Oliver maternity size. This eliminates guesswork and ensures you order pieces that will grow with you.
Important: If you are in any doubt about your size, check the detailed measurement chart provided above against your own measurements. Alternatively, contact Isabella Oliver customer services (available Monday to Friday, 9am–5:30pm BST) for personalised sizing advice.
Product-Specific Sizing Information
Isabella Oliver Jeans
Isabella Oliver's maternity jeans are considered a premium investment piece. Available in both under-bump and over-bump styles, these jeans are engineered to flatter throughout pregnancy and beyond. The jeans utilise a numeric sizing system (1–6) that corresponds directly to your pre-pregnancy size. Many customers find that the quality and timeless design justify the investment, particularly as the jeans often retain 50–70% of their original value on the resale market. Note that some customers report the fit can be generous, so if you're between sizes, consider your pre-pregnancy fit carefully before ordering.
Wrap Dresses & Occasion Wear
Isabella Oliver's signature wrap dresses and occasion wear pieces are designed with adjustable ruching that adapts to your changing body shape. These pieces often feature sustainable style potential, with many customers successfully wearing them post-pregnancy or reselling them online. When ordering occasion wear, check individual product measurements to ensure the length is appropriate for your height.
Tops & Everyday Essentials
The brand's range of maternity tops, including layering pieces and t-shirts, are cut generously to accommodate your growing bump whilst maintaining a flattering silhouette. Many pieces incorporate side ruching or strategic panel placement for a polished appearance. These items are typically machine washable, making them practical for frequent wear.
Sizing Tips
- Start with your pre-pregnancy size: Simply locate your usual UK clothing size and order the corresponding Isabella Oliver size number. If you were a UK 8, order size 1; if you were a UK 10, order size 2, and so forth. This straightforward system removes the confusion.
- Check individual product measurements: Each Isabella Oliver piece on their website includes detailed fit measurements in centimetres and inches on the product page. Compare these measurements against your own body measurements to ensure the specific garment will fit well, particularly for length-dependent items like dresses and trousers.
- Account for your height: All standard measurements are based on a customer of approximately 160–165 centimetres (5’4” to 5’6”). If you are significantly taller, always select the "Long" length option for trousers, and check dress/top lengths carefully. If you are shorter, standard lengths may be longer than desired.
- Factor in pregnancy progression: Isabella Oliver pieces are designed to grow with you throughout all three trimesters. However, if you're buying jeans, you might consider purchasing later in pregnancy rather than very early on to ensure maximum wearability throughout your remaining months.
- Consider your bra size independently: Cake maternity bras are sized separately from your clothing size. Take your underbust and bust measurements to determine your band and cup size. Pregnancy and hormonal changes can affect breast size, so measure yourself rather than assuming your pre-pregnancy bra size will apply.
- Plan for twins with a full size up: If you're expecting twins, increase your normal Isabella Oliver size by one full size. This accounts for greater weight gain and a larger bump, ensuring your maternity pieces remain comfortable and flattering throughout a multiple pregnancy.
- Invest in timeless pieces for resale value: Isabella Oliver pieces, particularly wrap dresses and occasion wear, maintain strong resale value online. If cost is a concern, purchasing versatile styles you can wear post-pregnancy or resell recoupes a significant portion of the original investment.
- Allow for fabric care in your planning: Most Isabella Oliver pieces are machine washable according to care labels. However, always check individual care instructions before washing, as some premium or specialty fabrics may require gentler handling.
- Contact customer services for personalised advice: If you remain unsure about your size after reviewing the charts and measurements, Isabella Oliver's customer services team are available Monday to Friday, 9am–5:30pm BST (4am–14:30pm EDT) to provide personalised sizing guidance based on your specific measurements and preferences.
Returns & Exchanges
Isabella Oliver offers a 21-day returns window from the date you receive your item (14 days for sale, outlet, and pre-loved items). Returns are processed within 14 working days of arrival at the warehouse. Once processed, refunds typically appear on your bank statement within 5 working days, though refund timing is ultimately controlled by your card issuer.
If you receive an item that doesn't fit as expected, follow the returns instructions provided with your order. All Isabella Oliver orders are gift-wrapped in tissue paper (outside of sale periods), so returns arrive beautifully packaged.
Additional Information
Payment: All transactions are processed in pounds sterling (GBP). Isabella Oliver accepts Visa, Visa Debit, Maestro, MasterCard, American Express, Google Pay, Apple Pay, and PayPal. You will be charged at the time you place your order, even for pre-ordered items.
International Sizing: Isabella Oliver serves customers internationally with European (EU) and Australian/New Zealand (AU/NZ) size conversions provided in the charts above. Always confirm your size using measurements rather than assuming international size conversions will match your usual non-Isabella Oliver sizes.
Customer Service: Isabella Oliver customer services are available Monday to Friday, 9am–5:30pm BST / 4am–14:30pm EDT. Contact them if you have any questions about sizing, measurements, or product fit before placing your order.