Sharon Case could make a burlap dress look good. She looks especially great in the white dresses and the yellow one she wore last week. Also I DON'T think the clothes Phyllis wears are flattering at all.
Of course, all the diva's dress well; they have designer dresses upon designer dresses from which to choice. That is part of the Y&R allure. But, if I had to choice I would choice Sharon (of course) and Gloria.
I think Gloria has exceptional taste in warerobe. I don't think she has ever had a bad dress day. She is always stylishly chic.