The most common and most likely answer to this crossword clue is the 7 letter word ULSTERS
U
L
S
T
E
R
S
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The straight part
We know that "Coats" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case coats = ulsters.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 ULSTERS mean?
ULSTERS noun- (clothing, men's attire) A long, loose overcoat made of wool or other rough material, often called a greatcoat, which sometimes features an attached shoulder cape covering the back and sleeves, and which can sometimes be buttoned in front.