Eliz, I have Mt Horse boots and gloves (the latter were really cheap). But their pants and jackets are way too expensive IMHO. I do ride in just usual warm fleece pants from either Boscov's or Kohl's in winter (and I don't care how I look really), but I need something for possible show and may be lessons.
As for Kerrits, I think as with every brand it depends on model. I have pull-ons by Kerrits I really like (they are very thin, so great to ride in hot summer), but I didn't like some breeches by them. In any case I going to try so will see!