I gave a compliment to a lady who served me in Cafe Rouge the other day. She wasn't dressed in the 'traditional' waitress garb, instead she wore a very pretty smart business like dresss, and a black jacket. I was so taken with her dress, I complimented her on it, and she thanked me and told me where she'd bought it..
She didn't take offence at all.. but maybe that's because I'm female.. (not that it should make any difference)...however with respect to the OP's question, I've had many of my customers comment on my mode of dress or hair style or similar in a positive way and I'm always delighted, because I feel that my effort in being well dressed for work is noticed, however I have to be honest and say that if a person of the opposite sex was to compliment me on my attractiveness as in how pretty I looked , I would be embarrassed thinking that he was coming on to me. Just my feelings, not necessarily how everyone else would think of course.