I expanded a costume to 95 after being stuck in another at 55 for ages and now I'm cruising through the game, where I was having some real trouble before.
On the more difficult stages I just need to take the potion that ups your hp a lot to get over 5000, which pretty much makes it a cakewalk. Loving the cleric still. I dabbled in the other classes, but free heal is just too nice to pass up (though getting those potion usage trophies is gonna be a bitch).
One think I've never used is the counters though. I mean I got the trophy like everyone else, just playing the game, but I don't know how to do a counter with the cleric. I also very rarely block, since I think the cleric has some surprisingly powerful combos.