Examples:

• You should let your hair down once in a while.
• RELAX - Let your hair down.
• I'll take the robe and you can let your hair down now.
• Why don't you let your hair down?
• Let your hair down a bit.
• Do you never let your hair down, woman?
• I think you need to let your hair down, pet. And, Roz...
• You know, let your hair down?
• Let your hair down.
• Oliver, what does it take to get you to let your hair down and let yourself have a little fun?