I've found that since I've been reading YLF and other style blogs that I am now people-watching much differently.
Before, I really noticed people who weren't well-dressed. The sloppy dressers seemed to just leap out of the crowd.
Now, I notice the nicely-dressed ones, and I find myself watching them to figure out why they're well dressed (usually has something to do with accessories and shoes, surprise, surprise).
And I'm moving on into separating the nicely dressed into different categories. Yesterday we were at a restaurant, and a large party of people came in. It was a mixed group of men and women, and it became clear (yes, I'm a shameless eavesdropper) that it was a business dinner and that two of the women were Canadian (probably Quebecois) and the other three women were local (Colorado). Everyone was very nicely dressed.
The American women (in general) had a lot going on with the hair (fluffy, teased, elaborate) and with the make up. The clothes tended to have more pattern.
The Canadian women had sort of a sleeker look - hair pulled back, classic rather than eclectic jewelry.
The woman I admired the most was apparently the guest of honor. Her dark hair was pulled back in a bun with a tortoiseshell clip (barrette, not claw). She wore small gold earrrings. She had on a very formfitting sleeveless black dress (and she was not super-thin), a thin white patent belt, and beautiful python pattern stiletto pumps. The only flaws I saw were that she had a very dark tan (which I don't particularly like, per Mac's 3 style/beauty trends thread) and that her bra strap occasionally made an appearance. But she looked so comfortable in her body and her closely fitting clothes! It was neat to be able to observe her and the others, and people in general with new eyes.