Through the first 67 games, here is how it breaks out for caps:
The Mets Police preferred blue cap: 9-5 (wow, that's only 20% of the games played)
The despised all-black caps: 7-7
The hideous blue brim/black cap: 17-21
The 1-day MLB promoted red cap: 1-0
Forgetting for a moment the Memorial Day cap, the Mets have a winning record only when they wear the traditional blue caps!
As for the uniforms:
Pinstripes: 2-3 (really? Only 5 times this year?)
All White: 14-8
Home Black: 4-1
Road Black: 3-6 (I derived these from the overall black uni record of 7-7)
Road Gray: 12-14
Wish I could report that the black jerseys were bad at home. Of course this is a small sample... (yeah I'm looking for a reason to discount that winning record).