I have actually finished a summer knit top before we get into the heat of summer! I'm astounded, myself, as I usually end up starting way too many summer tops and not finishing them before the end of summer (if at all). And I'm happy with it! Equally astounding!
Pattern: Aleita Shell by Bonne Marie Burns in Interweave Knits Spring 2008
Yarn: recycled from a thrift store sweater. I have long since lost the tags, but I remember linen and cotton in the fiber makeup.
Mods: I made the body longer before the split but other than that I followed the pattern (I think). Now that I've worn it, I think I should have knit another 1" - 1 1/2" on the ribbed top portion before splitting for front and back, but it's not something that will keep me from wearing the top.
It was a fairly quick knit but the yarn was getting on my nerves so I ended up setting it aside for a couple of weeks. The yarn is a flat tape type (not sure if that makes sense) yarn and is very inelastic, and I found that I was getting frustrated with how tired it was making my hands.
All in all, I love it. In fact, I think I need another one. In navy. or green. or maybe more than one.