Well, they could say that they have been workin out really hard and got mad muscles from em as a way to explain their bulky figure, even if it's someone like Yukiko. They have to some how explain how they sneak in the bikes, since they put in all the trouble of explaining all other aspects, even if the reasoning is questionable.
Nice sig TC
Thanks, I made a bigger one, but the img site I use has a size limiter, so had to shrink it a bit.
~~~PSN: YukiSeraph Persona 4 Golden: http://i.imgur.com/Ui84Q.gif
A majority of the armor, iirc, was lightweight stuff like robes and things, so that was understandable. The only people that could feasibly hide their weapons were Youske, Yukiko, Naoto and possibly Chie (depends on the weapon). Most of Yu's weapons were too big, Kanji's were usually folding chairs or about the same size as one.