A very long time ago (30+ years now) a wise man told me that full-on macho leather was really just another kind of drag.
We all have the right to express ourselves as we see fit. Personally, when I see someone who is not a lean, ultra-fit supermodel wearing A&F I think that's just another kind of drag as well. A business suit is a uniform, when it's personalized then it becomes another kind of drag.
I've never had the body to pull it off (let's start with my 10.5 EEE feet), and, except for some very burlesque Halloween costumes when in my 20s have never even attempted it. But kilts were a big thing later in the 80s, and I'll cop to having been seen in public wearing one on several occasions, with big, mean boots and a sweater.
There are actually at least three types of cross-dressers:
1) Mostly straight men who derive a fetishistic pleasure from wearing women's clothing;
2) Gay men who adopt "personas" in public (occasionally, not inevitably) that can go anywhere from full-on dresses, wigs, make-up and heels to rather bizarre gender-fuck costumes that usually just include platform shoes (or boots), wild wigs (or not) and a ton of make-up: otherwise they look like men (no fake tits, etc) and occasionally are very muscular and heavily tattooed, which are two very traditionally male forms of appearance;
3) Pre-op Trannies: some stay that way, others go for the big snip. But real-life Trannies take hormones and frequently have breast implants and other forms of surgery to make themselves look like "real" women. I socialize with a few of these people, and they live the look 24/7.
They are variations in the diversity that makes up humanity. Calling them "sick" is not just wrong, it's bigoted.