Just to follow up, I knit the Perfect Tee in Love-it, the fabulous bouncy yarn Berroco introduced for the spring season. Before I leave the topic of Love-It, I'd like to say that this yarn was an absolute joy to work with. It knit knits up like a high-quality cable spun merino - tight spin, smooth texture, and in the most darling little dumpling of a skein. Except Love-It isn't merino - it's not even wool - it's a cotton blend. Yeah, cotton. And it's stretchy - not crimped or weird stretchy, just stretchy enough that you know it'll keep its shape in knitted garments. And so soft - you'll just have to touch it for yourself.
I knit the Perfect Tee on 8s and got exactly 18 stitches in 4 inches, but I've also swatched it on 5s for 22 stitches to 4 inches, and the fabric still had nice drape, so you can use it in any pattern that calls for heavy worsted, worsted, or dk weight.
The Berroco pattern support for the spring is great too. Eileen Fisher on the left, Berroco on the right.