The most common and most likely answer to this crossword clue is the 7 letter word ROMPERS
I've seen this crossword clue in The Times
R
O
M
P
E
R
S
More clues leading to the result ROMPERS
Buddy explains!
The straight part
We know that "garment" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case garment = rompers.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 ROMPERS mean?
ROMPERS noun- Someone who romps or frolics.
- A ship that has moved far ahead of a convoy; see also straggler.
- A onesie.
- A one-piece garment for babies and small children, consisting of a top and trousers. A romper suit.