I think Kate got tired of wearing the wig.
The bun was a wig?! I feel cheated
I've always wondered who the Voyager hair dresser is. Surely they didn't expect to need one for a short mission.
The thing I love about Janeway's hair is it gives you a good idea of how much trouble Voyager is in, who needs red alert when you can look at Janeway's hair instead.
I need to learn how to put my hair in a Janeway bun. I'd also like to learn how to put my hair up like Seven's but I doubt I could put it up while walking like Seven can.