Originally Posted by emsr2d2
My personal feeling (still without really knowing what "customisable" means here") is that it sounds best as:
A customisable men's black suit.
There are obvious problems with "black men's suit". I did toy with "A men's customisable black suit" and I still quite like that.
I think the problem here is; without knowing exactly what "customisable" is supposed to mean, it's hard the place it in an order of adjectives.