Thanks, darla. I just now have the obvious (but unparseable - for me) 17A (Oh, now I see it - hmm) and the mysterious 20A remaining. Brain fog probably.
I don't think that just including a word 2x within all the text of the clues constitutes a clue to the theme - I guess you just have to be of a sartorial bent when you see a few of them turn up. Oh well.
I can wait for the 20A, just like the few I couldn't get last week, in 225.