This short sleeved cardigan from Jo Sharp Knit 7 is one of the quickest garments I have ever knit, not excepting baby clothes.
It is knit with 2 strands of yarn, one 8ply Alpaca Kid Lustre and one 8ply Soho Summer Cotton, on 10mm needles. I have made the smallest size, for my daughter who wears an Australian size 8-10, and it is quite loose on her. I am thinking of making another one and trying to size down the pattern.
I used shade Province 853 in the Kid Lustre, and Fog 250 in the cotton. I used one ball less of both yarns than called for in the pattern. A few customers have knit this cardigan, and they also used at least one ball less of each yarn for the short sleeved "vest" version, but found they needed all the balls recommended for the long sleeved version.