| Standard Sizes Rianne de Witte Collections, do not compare it with final length of style/design |
| XXS | XS | S | M | L | XL | XXL | |
| upperwidth | 84 | 86 | 90 | 94 | 98 | 104 | 110 |
| waist | 62 | 66 | 70 | 74 | 78 | 84 | 90 |
| hips | 92 | 94 | 98 | 102 | 106 | 112 | 118 |
| waistlength | 38.5 | 39 | 39.5 | 40 | 40.5 | 41 | 41.5 |
| armlength | 55 | 56 | 56 | 57 | 57 | 60 | 60 |
| upper width back | 30 | 31 | 32.5 | 34 | 34.75 | 35.75 | 36.75 |
| total body length | 172 | 172 | 172 | 172 | 172 | 172 | 174 |
| EU | USA | UK | UNIVERSAL |
| 32 | 2 | 4 | xxs |
| 34 | 4 | 6 | xs |
| 36 | 6 | 8 | s |
| 38 | 8 | 10 | m |
| 42 | 10 | 12 | l |
| 44 | 12 | 14 | xl |
| 46 | 14 | 18 | xxl |