Source: Unearthed Arcana 38 - Feats for Skills

You know how best to hide. You gain the following benefits:

• Increase your Dexterity score by 1, to a maximum of 20.

• You gain proficiency in the Stealth skill. If you are already proficient in the skill, you add double your proficiency bonus to checks you make with it.

• If you are hidden, you can move up to 10 feet in the open without revealing yourself if you end the move in a position where you're not clearly visible.