How about a quick idea for DnD 5e?
Light Armor Master
Prerequisite: Proficiency with light armor
You learn how to better move in flexible armor. You gain the following benefits:
- Increase your Dexterity score by 1, to a maximum of 20.
- While you are wearing light armor, gain a + 3. bonus to Dexterity(stealth) and Dexterity(acrobatics) checks.