To let your hair down means to relax and enjoy yourself, which is what the speaker wants to do with the woman.
Given the statement "Because you're a smart, pretty woman who I suspect is a lot of fun once you stop worrying about being dignified or behaving correctly and just relax and enjoy yourself.", is the statement "Because you're a smart, pretty woman who I suspect is a lot of fun once you let your hair down." is true?
- Yes
- No
- I don't know