Bladed Belt

Wondrous item, uncommon

This leather belt is formed of multiple strips of tanned leather connected by metal studs. Its steel buckle engraved with the outline of a weapon, often a spear or sword. As a bonus action, you can remove the belt and transform it into a one-handed piercing or slashing melee weapon of your choice. If you drop the weapon, it reverts to belt form.

You also can return it to belt form as a bonus action.