Looks like these girls don't want to wear anything below the belt anymore since Crash and Crunch always go topless, they decided to go bottomless instead while they pick out a new set of clothes.
Coco's attire is based on her various outfits from Crash Bandicoot 4: It's About Time, Crash of the Titans, and Crash: Mind Over Mutant, while Yaya's is somewhat inspired by Li Li Stormstout from World of Warcraft.