Is it legal to sell things you learned how to make in a craft book?

There are so many craft books out there that teach you how to make adorable and awesome things. Lately I found this book called Fashion Geek that shows you how to make some awesome techie clothes and accessories.

Now if I were to, say, make a bunch of these things and sell them to people at my local artisan’s market, would I be breaking the law? I looked at the book and couldn’t find any legal information regarding this in the fine print, but I want to be sure before I plan to sell things that were designed by someone else.