ok, after about 3 attempts, i am giving up trying the boss in the... "correct" way, a lot of waiting to start the fight, and it's slow...
So I used Cheat Engine, easy, Value Type: 4bytes
with cloth search for "1", lose cloth somehow, search for "0", pick cloth from the floor, and repeat, 1 with cloth, 0 without cloth... until only 3 values remain, freeze these values in 1, and that's it, now you have infinite cloth, even if you don't see it in the character, you will never lose your clothes, easy win the boss.
This is probably a secret boss to compensate for the end of the game... you can feel that this level was artificially hard, looking only at the enemies, they are not difficult, the other stages had much more hard enemies to evade, here is just the traps and the one hit cums kills, after all this was not supposed to be the final stage... but it will have to be, unfortunately. so this increase in difficulty was because we weren't "used to" with the final stages, and we ended up jumping from the easiests stages to the most difficult stage, if you compare, the difficulty of the stages was gradually increasing, one hour I believe it would really reach such difficulty