Unable to equip cape on classic skins

Steps to Reproduce:

1. Equip a classic skin;
2. Enable third person view to view the change more easily;
3. Enter the capes tab in the dressing room;
4. Equip any cape;
5. Exit to the "pause" menu, observe that your player model will accurately depict your classic skin wearing the cape you just equipped;
6. Return to the game.

Observed Results:
Your player model instantly turns into Steve, wearing no cape.

Expected Results:
Your player model retains your skin and cape.

Screenshots/Videos attached: Yes

Notes: