I guess it really depends on your work environment.. and how your manager is..
I'm the youngest where I work and even though everyone is very well dressed and fashionable, I'm the only one who has high end designer bags & shoes. But I'm lucky that they're not *****y about that sort of thing and get away with carrying and wearing whatever I choose.. with no negative comments!
However, I do have a friend who would not wear her designer items to work at all because she gets smirks and looks from co-workers..
I'm not sure if it's a factor but my workplace is 90% male.. hers on the otherhand is mostly female!