There is a video of Jane Birkin on the Russell Harty show in 1973. As she sits on a stool singing “Di Doo Dah,” a song about a girl who is flat chested (“it’s me!” she gleefully declares before she performs), she’s wearing a quintessential Jane Birkin outfit. Her hair is in a tousled top knot showing off the butterfly sleeves on her white eyelet tank top. The shirt is cropped perfectly to rest just above her worn- in blue jeans that are casually but purposefully rolled up to her ankle. It’s an outfit fit for a day in the park but made television-ready just because she was wearing it.