He loved her hair in a braid.
Lily Evans with her hair in a braid was one that had taken time in the morning to do it. She was laid back, like she had all the time in the world to do whatever she wanted or needed to do. She was in no hurry to get to class, no hurry to get her assignments done.
On the days she braided her hair, he knew he could find her outside on the lawns or quietly reading a book, taking her time with the day. Braid Days were leisure days, days when he was arguably least likely to get his head bitten off by provoking her.
Before they'd started dating, they were days she was more likely to turn him down gently, a simple 'No Potter' and not a derogatory name on her lips. Now they were days she was more willing to sit quietly in the same armchair, watching the fire crackle in the Gryffindor common room.
Braid days were good days.