Sewing with smooth/slippery fabrics

I am wanting to upgrade my sewing capabilities for myself, especially in my fabric choices. I've noticed that the fabrics I gravitate towards while shopping for blouses or dresses for myself tend to be polyester, silk, and I think rayon-- al fabrics that I typically avoid sewing with. And when I see the construction I think, I could make that, if I knew what fabric to buy! I gave the good fortune of being in New York City this week and going to the garment district a few times. But, I M uncertain what I should ask for, or look for in the stores. I figure I need to get something not-too-expensive for the learning curve, but-- since I'm here and this opportunity doesn't come along very often got me, I want to get my hands in and really look at fabrics I can "work up to." Anyone have advice and experience to share? I've made the weekend getaway,and while I love the design and fit, I made it in shot cotton, which though lovely, wrinkles like a beast. Normally wrinkles do t bother me, but it's annoying in the facings. I also want to make one or two of the dresses that Liesl has in the Butterick line from a smooth/ slippery fabric. What should I ask for? And how do I not look like a moron??!!