The most common and most likely answer to this crossword clue is the 6 letter word ONESIE
O
N
E
S
I
E
More clues leading to the result ONESIE
- Put back in wardrobe is enormous jumpsuit
- Soon perspire regularly in full-body garment
- Scrubbing top, doctor put on extremely intimate garment
- Old Scottish swimmer discards small item of clothing?
- Old Scottish monster eschewing top of Scottish garment
- Loose-fitting garment working, I see, in a different way
- Full-body garment from store is enormous – it must be returned
- Fancy seeing monstrous creature — swimmer’s heading off in full-body suit
- United side lacking depth — it looks silly to some
Buddy explains!

The straight part
We know that "full-body suit" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case full-body suit = onesie.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 ONESIE mean?
ONESIE noun- Name given to a number of one-piece attires