The most common and most likely answer to this crossword clue is the 4 letter word TASH
I've seen this crossword clue in The Times
T
A
S
H
More clues leading to the result TASH
Buddy explains!
The straight part
We know that "A man may wear one" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case a man may wear one = tash.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does TASH mean?
TASH noun- An Oriental silk fabric, with gold or silver thread.