I know the book of the month is usually fiction, but Zagat’s New York City Shopping Guide is a must-have if you live or are visiting New York. The guide gives mini reviews of the hottest shopping spots in all of New York and provides phone numbers/ addresses so it could be a good reference. You can search by borough, type of clothing etc. It has categories includign everything from vintage clothing to sex toys to swimwear. Plus the book is sleek and can fit perfectly into your purse.