You can buy #WorldDownSyndromeDay t-shirts for women in the following sizes:
| Ladies dress size UK | Ladies dress size US | |
| X Small | 8 | 4 |
| Small | 10 | 6 |
| Medium | 12 | 8 |
| Large | 14 | 10 |
| X Large | 16 | 12 |
| XX Large | 18 | 14 |
T-shirts are 100% cotton.
Prices are in British pounds (GBP).