I didn't know the unattractive "boy's haircut"...
...(as worn by Seberg) was fashionable in 1959 when this film was shot. I realize Mia Farrow later had this ugly haircut in 1967 for "Rosemary's Baby," but I didn't know it could be traced back quite a bit further.
The sad thing is Jean was stunning back in the 60s-70s, just not with this gross haircut.