This cloak, complete with a hood and coat tails that extend down past the wearer's knees, is designed by Tieflings, for Tieflings. When worn, unlike other clothing that must be modified to fit wings, tails, and horns, this cloak shunts the extremities into an extradimensional space. While worn, the wearer can push their wings and/or tail(s) into the inside of this cloak. The user can also pull up the hood, which stretches at first to cover the tops of their horns, before returning to a "normal" size, shunting the horns into the space as well. As an action, the wearer can don or doff the cloak, revealing or hiding their appendages

Any creature attempting to see into the space beyond while the user is wearing the cloak must make a DC 13 Investigation Check. On a failure, it looks like a normal cloak. On a success, the creature can see into the void beyond. 

The space adjusts to perfectly fit a set of wings, unfurled or tucked, as many tails as the user has, and as many horns as the user has. The space is never large enough for a full creature to fit inside of.