Bowler and boater (4)
I believe the answer is:
hats
'bowler and boater' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for hats that I've seen before include ""Porkpie" and "pillbox" attire" , "Milliner's stock" , "Headdresses" , "Headwear" , "Headgear" .)