My sister wore her orchestra uniform in her coffin but she was barefoot. We figured as long as it was lined with white silk with pillows inside let her feel it on her toes, she would have wanted it like that.
Most funeral homes bury people with their shoes on, a friend of mine works for one and she said if the family wants the person barefooted they just have to ask
I've never thought about that, I always assumed that they were since people in coffins are made to look asleep and almost everyone sleeps barefoot.