How do I change my character's appearance after picking up an item

So i’m making this game where the character can pick up an item that changes his clothes from white to purple. I have absolutely no idea how to approach this. Any tips? Screenshots would be preferred.

You need to create an animation, where one of the frames is the character with a different appearance, then do on collision with object -> set this to animation frame number #.

Thanks! Now when the character picks it up, he turns purple like I wanted. However, the original, white character has a walking animation, and when you turn purple, I’d like the newer, purple character, to also have a walking animation. Long story shot, how do I make it look like the purple one is walking?