The book that I have looked through and loved:
Seventeen presents.... 500 Style Tips (What to Wear for School, Weekends, Parties, and more!)
This book is great for women of all ages. But is very helpful for teenagers.
Some of the style tips I like:
#11 Super Skinny Jeans, looks great under longer tops so you show off your shape without revealing to much
#8 a menswear vest, gets a softer look with a fitted top and a jeweled pendant
#31 A bold-colored trench, is the perfect pop of color for a gray, rainy day
#214 A t-shirt and jeans can still make a statement if the tee is oversized and printed