One of Rapt0r's uniform mods will put the whole watch crew in grey leather.
Rapt0r's Uniforms V2.0 - has options for black or grey leather uniforms IIRC.
I don't know about the whole crew but maybe if you're using the mod anyway it's possible to sub in the same .tga files for the rest of the crew uniforms as well? I've never tried it since I like to have the guys who always stay in the boat in the flannel shirts and whatnot.