great visuals DL.
FWIW, (and I can't speak for the other cleanies) but personally, I think the reason clean and simple works for me is because I don't have a "clean and simple" body. "Unclean" outfits usually look confusing on my hourglass frame and visually add more curves than I care to add. "Clean" outfits both reign my curves in and also allow them to be the star of the show rather than have to compete with tons of "noise" in an outfit. This is why *I* think a slender rectangle does ALGO so well. The "noise" of the outfit isn't competing with alot of bodily curves. (and when I say "noise", I"m NOT saying that in a negative way at all, just can't think of a better way to say it)
Take DL's kitchen pictures for example. In photo 1, my eye doesn't know where to look and keeps darting around trying to figure out what to rest on. In kitchen #2, I see a sleek, clean, simple kitchen and I quickly focus on the window. I know it isn't the best parallel to dressing our bodies, but those were just some observations.