The original plain block colour viscose slinky garments are great (there I said it) if you find the shape that suits you. I must have 15 of Kim's sleeveless tops, vests, and camisoles and wear one almost daily. The long straight skirts and the collarless cardi shapes are also very flattering. I wouldn't dress head to toe in separates but the wrap dress shape suits me too. The viscose doesn't make me sweaty (not to be confused with polyester).
I bought my first piece 16 years ago just after my second C section and it's kept its colour ( I use washballs not bio washing powder).
So if you see a garment that is just what you're looking for I say order it, and if it isn't what you want return it under the distance selling regs and they'll refund your original p&Pp (you may have to chase them for this but I email them first using the phrase "Please confirm that the postage will be refunded without my having to chase it" and it does the trick).
Jude xx