I've learned from an early age not to judge people on what they wear to try to figure out who is sitting if F/C/Y (even though it can be a fun game at the gate while waiting for the Red Carpet to open)...

Last trip I was on, I saw at least four gentlement dressed in suits. I figured chances are I'll be sitting next to one of them. All were in Y. I was wearing jeans and a mock turtleneck. Its slightly dressy and its comfortable. I'll be sporting the look tomorrow for my transcon...in....gasp....Y!