Size Chart
Size guide
Use this UK gym apparel size guide to find your perfect fit across the full Before I Go range: oversized t-shirts, gym shorts, tank tops and crew socks. Every chart below is taken directly from the garment itself, with measurements in centimetres (and inches for shorts) so you can compare against your own body measurements before you buy.
Men's T-Shirts
The Weary Warrior · In Shadows We Glow · The Sculptor: Oversized/boxy fit, 100% organic cotton (220 gsm). Shop men's t-shirts →
| Size | Chest Width (cm) | Body Length (cm) | Sleeve Length (cm) |
|---|---|---|---|
| XXS | 47.5 | 64 | 20 |
| XS | 50 | 66 | 21 |
| S | 53 | 70 | 22 |
| M | 56 | 72 | 23 |
| L | 59 | 74 | 24 |
| XL | 62 | 76 | 25 |
| 2XL | 65 | 78 | 26 |
| 3XL | 68 | 80 | 27 |
The Devil In Me
Oversized/boxy fit, 100% organic cotton (260 gsm heavyweight). Shop The Devil In Me →
| XS | S | M | L | XL | 2XL | |
|---|---|---|---|---|---|---|
| 1/2 Chest | 55 | 57 | 59.5 | 62 | 64.5 | 67 |
| Length | 69 | 71 | 73 | 75 | 77 | 79 |
| Shoulder | 55 | 56 | 57 | 58 | 59.5 | 60.5 |
| Sleeve | 19 | 20 | 21 | 22 | 23 | 24 |
The Weary Warrior Women's Edition
Oversized, wide and cropped fit, 100% organic cotton (260 gsm). Shop the Women's Edition →
| XS | S | M | L | XL | 2XL | |
|---|---|---|---|---|---|---|
| 1/2 Chest | 55 | 57 | 59.5 | 62 | 64.5 | 67 |
| Length | 61 | 63 | 65 | 67 | 69 | 71 |
| Shoulder | 55 | 56 | 57 | 58 | 59.5 | 60.5 |
| Sleeve Length | 19 | 20 | 21 | 22 | 23 | 24 |
Please note a 1–3 cm difference is normal due to manual measurement.
BIG Tank Top
Fitted, 95% Cotton / 8% Spandex. Shop the BIG Tank Top →
| Size | Clothes Length (cm) | Bust (cm) | Suggested Height |
|---|---|---|---|
| M | 72 | 96 | 170cm |
| L | 74 | 100 | 175cm |
| XL | 76 | 106 | 180cm |
| 2XL | 78 | 110 | 185cm |
Also available in S. See product page for current stock.
BIG Shorts
Black · White · Grey. Comfort fit, 100% quick-dry polyester. Size up if you like a looser fit. Shop gym shorts →
| Size | Waist | Hip | Length | |||
|---|---|---|---|---|---|---|
| cm | inch | cm | inch | cm | inch | |
| S | 72 | 28.35 | 104 | 40.94 | 35 | 13.78 |
| M | 76 | 29.92 | 108 | 42.52 | 37 | 14.57 |
| L | 80 | 31.50 | 112 | 44.09 | 39 | 15.35 |
| XL | 84 | 33.07 | 116 | 45.67 | 41 | 16.14 |
| 2XL | 88 | 34.65 | 120 | 47.24 | 43 | 16.93 |
Retro Shorts
Black · Silver. Tight fit, 100% polyester. Size up if you like a looser fit. Shop gym shorts →
| Size | Waist (cm) | Hip (cm) | Length (cm) |
|---|---|---|---|
| S | 78 | 110 | 43 |
| M | 82 | 114 | 44 |
| L | 86 | 118 | 46 |
Silver colourway currently available in M and L only.
BIG Crew Socks
White · Black. Unisex, 100% Terry Cotton. Shop accessories →
| Sock Size | S | M | L | XL |
|---|---|---|---|---|
| UK | 2–4 | 5–8 | 9–11 | 12+ |
| EU | 34–37 | 38–42 | 43–45 | 46+ |
| US | 4–6 (W) / 4–5 (M) | 7–10 (W) / 6–9 (M) | 11–13 (W) / 10–12 (M) | 13+ (W) / 13+ (M) |
| JP (mm) | 225–240 | 240–255 | 260–275 | 280+ |
| Foot Length | 19–22 cm | 23–25 cm | 26–27 cm | >28 cm |
Black colourway currently sold as a single size (UK 2–7). White is available across S–XL.
One-Size Items
BIG Ankle Socks, BIG Beanie Hat, BIG Baseball Cap and the BIG Gym Towel are one-size and designed to fit most.
Frequently asked questions
How do I know what size to order from Before I Go?
Measure yourself and compare against the cm (or inch) columns in the chart for the specific product you're buying. Fits vary across the range, from the tight cut of the Retro Shorts to the oversized, boxy fit of our t-shirts, so always check the chart for that exact item rather than assuming sizing is the same across the whole range.
Do Before I Go t-shirts run big?
Yes. The Weary Warrior, In Shadows We Glow, The Sculptor and The Devil In Me are all designed with an oversized, boxy fit. If you prefer a closer fit, consider sizing down from your usual size.
Are the size charts the same for every colourway?
Yes, all three BIG Shorts colourways (Black, White, Grey) share identical measurements, as do both Retro Shorts colourways (Black, Silver) and both BIG Crew Socks colourways (White, Black).
What size are Before I Go socks?
BIG Crew Socks are sized S–XL, covering UK shoe sizes 2 to 12+. See the conversion table above for the equivalent EU, US and Japanese sizing.
* Measurements are approximate and may vary slightly by style, a 1–3 cm difference is normal due to manual measurement. Need help? Contact us and we'll be happy to help you find your size.