Hi ABT.
Me again.
I was already very familiar with the maritime phrase 'dress overall'.
When I saw Sammy's answer 'overall' (which may be the right answer in the mind of the quiz complier, for all I know) it didn't seem to fit the clue very well - so I suggested 'bunting' (which has the double-meaning of a bird which can fly and flags used to dress a ship). However, perhaps the clue wasn't as cryptic as I had thought.
Also, as I said before, if the quiz answer must only be human attire, then 'bunting' would not be correct.
BW.
JimC