The most common and most likely answer to this crossword clue is the 9 letter word OUTERWEAR
I've seen this crossword clue in The Guardian
O
U
T
E
R
W
E
A
R
More clues leading to the result OUTERWEAR
- Unfashionable clothing worn by queen — coat, perhaps
- 27, for example, wife found in location of canal
- True to form, runner put on old coat, perhaps?
- Coats, for example, being dated, we are modelling to get right
- Public regiment about to accept external cover-up?
- Fur coat? Ring gets wife’s attention
- Overall, we are mad to cut foreign tour
Buddy explains!

The straight part
We know that "Overall" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case overall = outerwear.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 OUTERWEAR mean?
OUTERWEAR noun- Clothing (such as a dress) worn over one's underwear
- Clothing (such as a rain jacket) worn over one's clothes when outdoors