| Abbreviation | Definition |
|---|---|
| WXF | Waterproof, eXtra-Fine |
| WXXF | Waterproof, eXtra eXtra-Fine |
| WXXL | Women's eXtra eXtra Large |
| WYIB | With Yarn In Back |
| WYIF | With Yarn In Front |
| WYOB | Wear Your Own Bra |
| WYW | What are You Wearing? |
| WZTJ | Women's Zip Tri Jersey |
| X | Xtra |
| XC | Xtra Cheap |
| XCR | Excelerace Boots |
| XFASHION | IT'S Fashion |
| XFG | Xtreme Function Golfwear |
| XL | Extra Large |
| XLB | Extra Large Big |
| XLB | Extra Large for Boys |
| XLJ | eXtra Large Jacket |
| XP | eXtra Pretty |
| XS | eXtra Short |
| XS | Extra Small |