To ensure that you don't get the wrong size, you can conveniently take your favourite T-shirt and measure it in the following manner:
1. Lay it on your bed, stretched flat. Use a ruler or measuring tape to measure the width from armpit to armpit (A dimension on illustration).
2. Now measure the height of the shirt from the neck down (B dimension on illustration).
3. With this height and width information, consult the tables below for the particular model of t-shirt you want) to find the measurement that comes closest to yours.
NOTE: Sizes may vary +/- 1 cm
Men's sizes
Men's T-shirt, short sleeve
 | XS | S | M | L | XL | XXL | 3XL | 4XL | 5XL |
| 48 A (cm) | 50 | 53 | 55 | 58 | 61 | 65 | 68 | 72 | |
| 64 B (cm) | 69 | 72 | 73 | 75 | 78 | 79 | 83 | 88 |
Men's T-shirt, V-neck
 | S | M | L | XL | XXL | |
| A (cm) | 50 | 53 | 56 | 58 | 61 | |
| B (cm) | 70 | 72 | 74 | 76 | 78 |
Men's T-shirt, baseball style
 | S | M | L | XL | XXL | |
| A (cm) | 47 | 52 | 54 | 58 | 60 | |
| B (cm) | 62 | 67 | 67 | 73 | 75 |
Men's T-shirt, long sleeve
 | S | M | L | XL | XXL | 3XL | 4XL | 5XL | |
| A (cm) | 51 | 55 | 57 | 59 | 64 | 69 | 70 | 72 | |
| B (cm) | 69 | 70 | 74 | 75 | 78 | 78 | 80 | 80 |
Men's T-shirt, tank top
 | S | M | L | XL | XXL | |
| A (cm) | 44 | 47 | 50 | 53 | 56 | |
| B (cm) | 66 | 68 | 70 | 72 | 76 |
Men's hoodie
 | XS | S | M | L | XL | XXL | 3XL | |
| A (cm) | 48 | 51 | 54 | 57 | 60 | 63 | 66 | |
| B (cm) | 67 | 68 | 69 | 70 | 71 | 72 | 73 |
Man Sweatshirt
 | XS | S | M | L | XL | XXL | 3XL | |
| A (cm) | 48 | 51 | 54 | 57 | 60 | 63 | 67 | |
| B (cm) | 70 | 71 | 72 | 73 | 74 | 75 | 76 |
Pijama Unisex (T-shirt)
 | XS | S | M | L | XL | XXL | 3XL | 4XL | |
A (cm) | 45 | 48 | 51 | 54 | 57 | 60 | 63 | 66 | |
B (cm) | 67 | 69 | 71 | 73 | 75 | 77 | 79 | 81 |
Pijama Unisex (Trousers)
 | XS | S | M | L | XL | XXL | 3XL | 4XL | |
A (cm) | 33 | 34 | 35 | 37 | 40 | 43 | 46 | 50 | |
B (cm) | 105 | 107 | 109 | 111 | 113 | 115 | 117 | 119 |
Women's sizes
Women's t-shirt, short sleeve, premium quality
 | S | M | L | XL | XXL | 3XL | |
| A (cm) | 40 | 43 | 46 | 49 | 52 | 56 | |
| B (cm) | 58 | 60 | 62 | 64 | 66 | 71 |
Women's Sports T-shirt (light)
 | XS | S | M | L | |
| A (cm) | 44 | 48 | 51 | 55 | |
| B (cm) | 60 | 64 | 65 | 68 |
Women's Sports Heather T-shirt
 | XS | S | M | L | |
| A (cm) | 40 | 44 | 48 | 52 | |
| B (cm) | 57 | 59 | 62 | 64 |
Women's Sports T-shirt (V-neck)
 | S | M | L | XL | XXL | |
| A (cm) | 41 | 44 | 47 | 50 | 53 | |
| B (cm) | 61 | 63 | 65 | 67 | 69 |
Women's racer back tank top & Loose Fit
 | S | M | L | XL | XXL | 3XL | |
| A (cm) | 44 | 47 | 50 | 53 | 57 | 60 | |
| B (cm) | 62 | 64 | 66 | 68 | 69 | 71 |
Deep collar women T-Shirt & Loose Fit
 | S | M | L | XL | XXL | |
| A (cm) | 47 | 49 | 51 | 56 | 60 | |
| B (cm) | 69 | 71 | 73 | 75 | 77 |
Women's T-shirt, baseball style
 | S | M | L | XL | |
| A (cm) | 41 | 44 | 47 | 50 | |
| B (cm) | 58 | 60 | 62 | 64 |
Women's t-shirt, mandarin collar
 | S | M | L | XL | |
| A (cm) | 40 | 42 | 46 | 48 | |
| B (cm) | 56 | 59 | 60 | 62 |
Women's t-shirt, long sleeve
 | S | M | L | XL | XXL | |
| A (cm) | 39 | 42 | 47 | 48 | 52 | |
| B (cm) | 59 | 62 | 64 | 65 | 68 |
Women, hoodie
 | XS | S | M | L | XL | XXL | |
| A (cm) | 44 | 47 | 50 | 53 | 56 | 59 | |
| B (cm) | 62 | 63 | 64 | 65 | 66 | 67 |
Unisex sweatshirt
| XS | S | M | L | XL | XXL | 3XL | |
| A (cm) | 48 | 51 | 54 | 57 | 60 | 63 | 67 | |
| B (cm) | 70 | 71 | 72 | 73 | 74 | 75 | 76 |
Children's sizes
Children's T-shirt, short sleeve (Unisex) (Size by years)
| 1/2 | 3/4 | 5/6 | 7/8 | 9/10 | 11/12 | |
A (cm) | 30 | 33 | 36 | 39 | 42 | 44 | |
B (cm) | 40 | 44 | 46 | 49 | 53 | 57 |
Children's T-shirt, long sleeve (Unisex) (Size by years)
 | 3/4 | 5/6 | 7/8 | 9/11 | 12/14 | |
A (cm) | 29 | 32 | 36 | 40 | 44 | |
B (cm) | 42 | 45 | 50 | 54 | 57 |
Kids hoodie
 | 3/4 | 5/6 | 7/8 | 9/10 | 11/12 | |
| A (cm) | 36 | 38 | 40 | 43 | 46 | |
| B (cm) | 47 | 50 | 53 | 57 | 61 |
Baby Sizes
Baby bodysuit (Size by months)
 | 0/9 | 9/12 | 12/18 | |
A (cm) | 24 | 26 | 28 | |
B (cm) | 41 | 43 | 46 |