What does modemäßig mean?
I have seen it while playing a German game, from the context I can assume it is something related to trends. I have also seen the ending "mäßig" from time to time.
I think, in English one would say in matters of fashion (modemäßig).
Edit: Please have a look at this website for examples of the suffix "mäßig": http://www.canoo.net/services/WordformationRules/Derivation/To-A/Suffixe/maessig.html?lang=en