"This image got posted by Fatknack (also known as Fuzzy Knuckles), one of the developers of the game and it shows many planned outfits for the characters of the game. By looking at it we can notice a few things:
1) There are many versions of different colors of the same costume (it's not know if you'll be able to change the costume's color of your character or if the color will automatically be changed based on your character's color; I assume it's the first one as every character in the image is red)
2) Some costumes are shown with the character holding an object too other than simply wearing some clothing, it's not know if you'll be able to add extra objects to your character or if you'll find A.I. enemies in the (planned) Story Mode that will have weapons they can use against you (I also assume that the pirate guy's sword is made of plastic and it can't actually cut anything, as the devs said they don't want to add bladed weapons or guns in the game...)

Let's also remember how the devs said that they want to make the clothing more destructible/interactible (caps of superheroes costumes will be able to rip off, clown noses will sound when punches, pants will be able to be took off if a lot of force is applied on them and hats will fall off if the character recieves a strong hit to the head; the last "falling hat" option was avaible in the "stable" build v0.1.5a but it got removed in the "Unstable" build. I think it will be re-added sooner or later ad the devs said they want to add a "Stomp on the hat" game mode where you'll have to make other players' hats fall off their head and stomp on them to score)

NOTE: I posted this image here for making it easier for the game's Steam community to find it, so that they don't have to look for it on Twitter. I do not proclaim to own it, it belongs to the original creator (that is the developer Fuzzy Knuckle, also known as FatKnack)"