I always love the look of fisherman's rib or brioche knits. It does take extra time though to knit as it takes two rows of knitting to gain one row in height.
Patons Dreamtime 4 ply Book 1271 has some lovely knits for children up to 18 months of age. It has a lovely vest on the back cover. I knitted this one in Bendigo Woollen Mills 4 ply yarn in Mint.
The pattern is a simple two row repeat:
Row 1: Sl1, *K1B, P1 * to end
Row 2: Sl1, *P1, K1B* to last 2 stitches , P1, K1
Grandmother and knitter from the land down under of fine merino wool.