Can't see custom skin in single player world.

After i save and select my custom skin in the launcher, i don't see it in my single player world.

What I expected to happen was:
Load in single player world with custom skin.

What actually happened was:
Load in single player world whit default skin

Steps to Reproduce:
1. Load a custom skin in the launcher.
2. Save and select it.
3. Start a world in single player.