Welcome to the BestMerchLab sizing lab. To get the perfect fit, measure a garment you already own and love, then compare it with the charts below.

💡 Quick tip for US customers: all our apparel follows standard US retail sizing. Prefer a loose or oversized look? Order one size up.

👕 1. Unisex Classic T-Shirt

Pre-shrunk 100% cotton with a classic straight cut. Standard US retail sizing. Measurements are taken with the garment laid flat.

Size	Width (in)	Length (in)	Your Chest (in)
S	18″	28″	34 – 37″
M	20″	29″	38 – 41″
L	22″	30″	42 – 45″
XL	24″	31″	46 – 49″
2XL	26″	32″	50 – 53″
3XL	28″	33″	54 – 57″
4XL	30″	34″	58 – 61″
5XL	32″	35″	62 – 65″

🧥 2. Heavyweight Hoodie & Sweatshirt

8 oz fleece-lined pullover with a relaxed fit. Roomier than our tees by design. Measurements are taken with the garment laid flat.

Size	Width (in)	Length (in)	Sleeve (in)	Your Chest (in)
S	20″	27″	33.5″	34 – 37″
M	22″	28″	34.5″	38 – 41″
L	24″	29″	35.5″	42 – 45″
XL	26″	30″	36.5″	46 – 49″
2XL	28″	31″	37.5″	50 – 53″
3XL	30″	32″	38.5″	54 – 57″
4XL	32″	33″	39.5″	58 – 61″
5XL	34″	34″	40.5″	62 – 65″

🎽 3. Unisex Jersey Tank

Airlume combed cotton with side seams and a retail fit. Runs slightly trim. Measurements are taken with the garment laid flat.

Size	Width (in)	Length (in)	Your Chest (in)
XS	16.25″	26″	30 – 33″
S	18.25″	27″	34 – 37″
M	20.25″	28″	38 – 41″
L	22.25″	29″	42 – 45″
XL	24.25″	30″	46 – 49″
2XL	26.25″	31″	50 – 53″

📐 How we measure

If you are between two sizes, go with the larger one.

• Width (Chest): Lay the garment flat and measure straight across the chest, 1 inch below the armhole.
• Length: Measure from the highest point of the shoulder straight down to the bottom hem.
• Sleeve: Measure from the centre back of the neck, along the shoulder, down to the wrist.

💬 Still unsure about your size?

No stress — our team will help you get it right before you order. Reach us on WhatsApp at +84 866 667 731 or email hi@bestmerchlab.com. We usually reply within a few hours.