Haircut

It is possible to receive haircuts in Fallout 3.

Possible Hair Stylists
You must choose a hairstyle at the start of the game when designing your character. There are a number of other places through the game where you can change your chosen hairstyle and color.

Wadsworth/Godfrey
If you own a house in Megaton, your personal robot butler Wadsworth will be able to give you a new trim or shave your beard. If you choose the Tenpenny Tower Suite then Godfrey will perform the same service.

Butch DeLoria
You can receive a haircut from Butch if you have him as a follower.

Snowflake
A haircut is also available from Snowflake in Underworld.