Still, changing clothe style once in a while to surprise your partner isn't a bad thing~
It isn't like you are changing yourself. Getting used to wide variety of clothing is not changing yourself nearly as much as simply getting used to something new.
Though she was talking about completely changing her style and mannerism, which is kind of a huge leap you don't need to take if you don't want to. Personally I would do it myself whilst retaining my core traits, but each to their own. I don't see changing yourself as a bad thing.