I'm just now getting into cycling, riding on bike paths and some on the street. I was looking for something appropriate to the hobby/activity and more form fitting; baggy t-shirts get you by for only so long. Honestly? Wearing cycling gear makes you feel like you're a bit more in the cycling community and has made me more confident when around other riders. That fact gets me out cycling more often.
Cycling is my weight loss activity of choice. I'm currently 275 (and 5'11"). The XXL is really snug, but doesn't make me feel embarrassed like a couple of jerseys I tried on at my LBS. I'm still pulling down the front from time to time over my slowly disappearing belly, and as such still wear a sleeveless base layer, even on overly warm autumn days (hopefully not by next summer). I've matched it (the black/black) with blue arm warmers or a colored long sleeve compression shirt under on cooler days and gotten compliments on the look. When I'm confident enough for road rides I'll opt for the green or yellow for more visibility, but for now the black is a mental comfort thing.