Here's how to get new weapons. In
 order to do this you must beat a
 majority of the bosses with the
 character you want the new weapon
 for. Then when you beat the game
 and it shows the ending then the
 credits it should say you have the
 new weapon and you'll have the
 option to save the game, save it and
 when the title screen reappears load
 the game you just saved and you'll
 start out at the begining with the
 new weapon.

 To get new clothes beat the game
 and save it when prompted after the
 credits, then when the title screen
 reappearst load the game and all
 your characters will start out with
 new clothes in their arms menu.
 Each character has 3 outfits
 including their original one and some
 of the characters have new outfits
 that get put on when you equip their
 new weapons. 

 by Greg Harvell