Excluding undergarments, there are currently 15 armor slots (plus ~2 practical weapon slots) that can be equipped per character. However, macros are limited to only 10 lines, forcing players to create multiple macros to change gear when switching classes.
Please increase the number of lines per macro, ideally to somewhere in the 20 range. Originally, I was going to suggest simply saving gear configuration, but with the frequency of gear repair, that could prove problematic. Longer macros would seem to be a superior solution.