There are four different categories for Clothing:
These categories appear in the Tailoring Tab:
They are also included in the upper right corner of each Clothing Item description:
Tailoring Events reward players for tailoring specific Clothing items. The categories included in the Event are specified in the Event Information. To make sure that you are synthesizing the right item, go to your Hot Events, and confirm this information under “Requirements”.
If the Event specifies that only Clothes will count for the Rewards, you will not be able to use Hats, Weapons, or Wings for it.