I am a professional seamstress. I alter formal wear. Mostly wedding gowns, prom dresses etc. If you have taught yourself quilting, then you can teach yourself garment making. I am doing the opposite of you. I am now teaching myself to quilt. Bottom line, if you are self taught, then you can pretty much sew anything, once you learn. Just take your time. Patterns can be tricky to read sometimes, but that is when I would go to my closet and look at something already done, like a collar of vest or whatever. Once I could see it, then I understood. By all means use cheap fabric as a model. Get it sewn and fitted the way you like it. Then "go get em" with the final fabric. Would love to see a picture when you are finished.