As a matter of fact, I *have* seen kimonos being worn, by members of a friend's family at the reception following a traditional religious ceremony. Her mother wears traditional ethnic clothing quite often, just because it's more comfortable for her to wear what she's used to. And also at the various festivals at the local Japanese churches that Wayne and I go to. There's always at least one attendee (not someone working the festival) in kimono.
There are plenty of stores in San Francisco's Chinatown which sell them. I went into one with a friend, and the salesclerk was quite pointed in announcing when I walked in that there was nothing here my size, and directed me to the seamstress shop around the corner where they could custom make one in a size that I would not find off the rack in any kimono shop.
I also see saris worn on a regular basis -- the owner of my corner store wears them almost every day.