Of course it's offensive. I don't see why Cookson shouldn't be involved.
Even if he isn't solving all the big problems to everyone's liking, there's no reason he shouldn't take on the small stuff that could probably be resolved with all of one letter or phone call.
If it takes a small portion of one of his days to get rid of that innapropriate atrocity of design, then I see no reason why he shouldn't. If women's cycling is working to make itself more legitimate, team kits such as that Colombian embarrassment are hardly the way forward.
To pretend that that "costume" is anything other than demeaning to women, is disingenuous.