As a Roblox developer, it is currently too hard to know how a character will look with my current outfit. In order to see how the character will look with my current outfit, I have to join an experience with an in-game catalog.
If Roblox is able to address this issue, it would improve my development experience because it will remove a major inconvenience from the platform. The button would work similarly to the Try On button for accessories and clothing. When trying on a character, my layered clothing, accessories, and idle animation get transferred over. This will allow me to see how the character will look with my current outfit.