The most common and most likely answer to this crossword clue is the 6 letter word ATTIRE
A
T
T
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E
More clues leading to the result ATTIRE
Buddy explains!

The straight part
We know that "Dress" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case dress = attire.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 ATTIRE mean?
ATTIRE noun- (clothing) One's dress; what one wears; one's clothes.
- The single horn of a deer or stag.
- To clothe or adorn.