One Piece Size Guide
One Piece is an anime-themed clothing and merchandise brand offering a curated collection of apparel, swimwear, and accessories for fans worldwide. The brand follows standard UK and international sizing conventions and is committed to true-to-size fits across its product range. One Piece garments are designed with attention to both comfort and flattering silhouettes, making the brand suitable for a wide range of body types and preferences. Whether you're shopping for casual everyday wear, graphic tees, swimwear, hoodies, or collectible merchandise, this size guide will help you find your perfect fit.
How to Measure
- Chest/Bust: Measure around the fullest part of your chest or bust while wearing minimal clothing. Keep the tape measure parallel to the ground and snug but not tight.
- Waist: Measure around your natural waist (the narrowest part) without pulling the tape too firmly. This should feel comfortable and allow one finger to slip underneath.
- Hips: Measure around the fullest part of your hips and bottom, keeping the tape parallel to the ground.
- Record all measurements: Write down your measurements in both centimetres and inches to easily cross-reference the size charts below.
- Compare to the chart: Locate your measurements on the appropriate size chart and select the size that most closely matches your body, prioritising bust and hip measurements.
Women's Size Chart
| Size | UK | US | EU | Bust (inches) | Waist (inches) | Hips (inches) |
|---|---|---|---|---|---|---|
| XS | 6 | 2 | 34 | 30–32 | 24–26 | 33–35 |
| S | 8 | 4 | 36 | 32–34 | 26–28 | 35–37 |
| S | 10 | 6 | 38 | 34–36 | 28–30 | 37–39 |
| M | 12 | 8 | 40 | 36–38 | 30–32 | 39–41 |
| M | 14 | 10 | 42 | 38–40 | 32–34 | 41–43 |
| L | 16 | 12 | 44 | 40–42 | 34–36 | 43–45 |
| L | 18 | 14 | 46 | 42–44 | 36–38 | 45–47 |
| XL | 20 | 16 | 48 | 44–46 | 38–40 | 47–49 |
| XL | 22 | 18 | 50 | 46–48 | 40–42 | 49–51 |
| XXL | 24 | 20 | 52 | 48–50 | 42–44 | 51–53 |
Men's Size Chart
| Size | UK | US | EU | Chest (inches) |
|---|---|---|---|---|
| S | – | – | 46 | 36–38 |
| M | – | – | 48 | 38–40 |
| L | – | – | 50 | 40–42 |
| XL | – | – | 52 | 42–44 |
| XXL | – | – | 54 | 44–46 |
Product-Specific Guidance
Anime-Themed Graphic Tees & Tops
One Piece graphic tees and character-inspired tops are designed with a relaxed, comfortable fit suitable for everyday wear. These items typically run true to size in both men's and women's cuts. If you prefer a fitted silhouette, choose your usual size; if you like a looser, oversized look, consider sizing up one size. Check individual product photos for print placement to ensure graphics sit where you'd like them.
Swimwear
One Piece swimwear is constructed with a firm, tailored fit designed to flatter and support your shape. This category requires careful sizing. If you find yourself between two sizes—particularly if your top and bottom measurements suggest different sizes—we strongly recommend choosing the larger of the two. For example, if you wear size 10 on top but size 12 on the bottom, select size 12 for optimal comfort and coverage. Tall customers with longer torsos should also consider sizing up.
Hoodies & Sweatshirts
Casual layering pieces like hoodies are typically offered in unisex sizing and run true to size with a relaxed fit. Measure your chest at the widest point and compare to the size chart. If between sizes, size up for a comfier, oversized aesthetic.
Branded Merchandise & Collectibles
Branded merchandise items (bags, hats, accessories) follow standard sizing. One-size pieces are designed to fit most wearers; adjustable items like caps include straps or ties for customised fit.
Sizing Tips
- If you're between sizes, One Piece recommends selecting the larger size, especially for swimwear and fitted garments. This ensures comfort and allows room for natural movement.
- Always check product-specific size charts and product photos before purchasing, as fit can vary between categories.
- For swimwear, prioritise hip and bust measurements over waist when choosing your size, particularly if you have an athletic or curvy build.
- Graphic tees and casual tops are designed to sit comfortably; measure across your widest point at the chest for the most accurate fit.
- One Piece garments are true to size across international sizing conventions—UK 10 corresponds to US 6 and EU 38 in women's sizing.
- If you're tall or have a longer torso, consider trying the next size up in swimwear and fitted pieces for better coverage and comfort.