TBH I think it depends on the SLR and the lens.
The Pentax M series bodies in black with a small lens just look quietly competent. People equate "serious" with a big chunky camera with battery grip and a lens the size of a drainpipe. While I can fit a winder and big lenses to my black MX I can also clip a small prime on and take unobtrusive shots in a city centre.
Check how loud the winder is if you're buying a compact with auto wind. I have an old Olympus Trip AF Super here which belonged to my grandfather and is painfully noisy.