The longest common clothing-related answer is “wearing apparel” at 14 letters. A shorter but often cited clothing word is “raiment” at 7 letters.

Quick note

If you meant a specific clothing item rather than a general term, the answer can change depending on the word list used.

Examples

  • Wearing apparel — 14 letters.
  • Compression stockings — often appears in “things people wear” lists, but it’s a phrase, not a single word.

TL;DR

For a general clothing term, wearing apparel is the longest result found in the source list.