The pattern specifies a size 5 steel hook, which is not available on Ravelry’s hook options.

You will need three 1/4” buttons. If you cannot find buttons that are small enough, you may want to try sew on hook-and-eye closures.

This is a t-shirt-style short-sleeved top for the Free Spirit Amigurumi doll, linked here on Ravelry.

Yardage may vary based on the options you choose in the pattern, but one standard ball of size 10 crochet cotton will yield several garments.