I take 1 suitcase, a 26" expandable. My carry-on is the size of a large purse with only my money, documents, snacks, book, etc. I do not carry any clothes in my carry-ons. Mix and match everything you pack so you can make lots of outfits. If it doesn't match, do not take it. I pack 2 pair of shoes, 1 dress, 1 sandal and I wear 1 pair.
The key is never take more luggage than you can handle by yourself.