Solomon Brothers' Junior Disguise Kit (4e Equipment)
From D&D Wiki
Inside this little rectangular polished steel case is a somewhat convincing mustache. Though it doesn't appear to be made of any sort of actual hair, it's at least shaped very well. Just be careful with it!
Though not a break through in the field, the Solomon Bros. Junior Disguise Kit can help in a pinch at least. It provides a +2 bonus to Bluff, though it must be worn for the bonus to take effect. It is reusable, but fragile, so care must be taken when removing the mustache. It is a DC 12 to successfully remove the mustache without having it break.
Cost: 25 GP