I used a stretchy yarn that you have to order online (even my local yarn store had only 3 balls and it only came in this tie-dye color so I had to use it – but it turned out cute). It’s called Cascade Fixation and I. Love. This. Yarn. Once you get used to working with it, there’s no problem. This is only my second “real” crochet project ever so I am going easy on myself. The bottoms turned out a little large but when I washed them they did shrink a little bit. The hat turned out perfectly. I think I’m going to try to work it in the round next time so there’s no seam on the back. It is so stretchy and soft — perfect for fitting babies. The pattern can be found in Annie’s Attic Crochet book “Diaper Covers & Caps” #871058. Hook up with me on Ravelry (name: 10cowife) if you make any of these – I’d love to see different color combinations. And if you’ve got the flower on page 18 figured out — please let me know!!!