https://worldbuilderblog.me/2016/07/14/common-potions/
Potion Common
This potion’s container looks half empty (of half full if you’re optimistic) but feels as though it is full of the purple liquid within. When you drink it, roll any die. If you roll an even number, you become invisible above the waist. If you roll an odd number, you become invisible below the waist for 1 hour. Anything you wear or carry on that part of your body is invisible also invisible. While half invisible like this, you have advantage on Dexterity (Stealth) checks made to hide. The effect ends early if you attack or cast a spell.