| Order Sizes | XS | S | M | L | XL | 2XL | 3XL | 4XL | 5XL |
| Approximate chest size (Inches) | 34-36" | 38" | 40" | 42" | 44" | 46" | 48" | 50" | 52" |
| Approximate chest size (cm) | 85-92 | 97 | 102 | 107 | 112 | 117 | 122 | 127 | 132 |
| Waist size (Inches) | 30" | 32" | 34" | 36" | 38" | 40" | 42" | 44" | 46" |
| Waist size (cm) | 77 | 82 | 87 | 92 | 97 | 102 | 107 | 112 | 117 |
Gilbert Junior Clothing:
| Order Sizes | 7XS | 6XS | 5XS | 4XS | 3XS | 2XS |
| Age | 3-4 yrs | 5-6 yrs | 7-8 yrs | 9-10 yrs | 11-12 yrs | 13+ yrs |
| Approximate height (cm) | 104 | 116 | 128 | 140 | 152 | 164 |
| Approximate chest size (Inches) | 22-23" | 24-25" | 26-27" | 28-29" | 30-31" | 32-33" |
| Approximate chest size (cm) | 57-60 | 61-64 | 65-69 | 70-74 | 75-79 | 80-84 |
| Waist size (Inches) | 18" | 20" | 22" | 24" | 26" | 28" |
| Waist size (cm) | 47 | 52 | 57 | 62 | 67 | 72 |