One of my favorite things to do is to take a simple, yet well-fitted T-Shirt pattern, (I love my mom’s Palmer/Pletsch Basic Knit Tee #M6964) and find really interesting, even unusual fabric to make it out of. I take the one T-shirt pattern and fit it slightly differently for each type of knit based on its weight and stiffness.
http://blog.palmerpletsch.com/fashion-knits-designing-with-a-simple-pattern/
Palmer Pletsch Sewing Blog 