Fun Knits
Part of the wonderful "Let's Knit Series", this book features 15 knit and crochet designs for sweaters and vests.
Note that the book is written in Japanese, but patterns and schematics are included. Crafters who cannot read Japanese but who have some knitting and crocheting experience are usually able to interpret the instructions without any trouble, and others can use the projects as inspiration for their own creations.