It is more typical of baptist culture, but you should visit the south. Baptist churches in the south are a whole different culture from baptist churches in California.
I will sometimes wear jeans and a t shirt to church, but only when my church clothes aren't cleaned.
Reformed Baptists are significantly different from non-reformed baptists though, but a lot of the conservative culture is the same. Separation from the world is a big deal in baptist circles, so there's a lot of things we don't do that say, an Acts 29 church would do.
I have two friends, same age as I, who go to a traditional baptist church in East Prarie, MO... and they wear full tuxedos to church, but no one else does. The most dressed up my church gets, is we have one guy who wears sweater vests with his dress shirt. Jeans or long jean skirts are common. A lot of it has to do with the culture of the church as well.