I think so, granted, if you chose to keep Sleepy Dawgs updated it already did download it and all it will download after you buy is like a kilobytes sized thing to let you play it. At least that's what happened when I got the Nightmare DLC.
First, have you finished the main story? If not, I think stay away from things like money and exp DLC, makes things too easy. I enjoyed messing around dressed as a gang member from Big Trouble Little China.
http://store.steampowered.com/app/215240/ Only played Nightmare DLC, it was okay, pretty short, but acceptable for the sale price. I saw a Quick Look of Zodiac Tournament and it seems awesome, retro Kung Fu goodness, if albeit on the short side. Other than that, the costumes are as recommendable as your taste sees fit.