I just started watching the show and started with season 3 and have made my way through the first part of season 4. It seems that the characters wear the same clothes. Am I see correctly?

Only thing I've noticed is that whenever Jim gets home from somewhere (mostly work), he goes into the coat closet, takes off his suit jacket, and puts on another one...always the same one probably. This may happen only in the later episodes, but I've noticed it several times.