Soulcalibur IV

Most credit goes to x360a for the main tip, and that is to play Floor 11 on Tower Of Lost Souls mode, because you have a high defense, and are up against 4 characters with high defense too.

To add my own input to this solution, I used Voldo, but the following should work for any character:

For the head armour, use X to hit high. Works best following a hold joystick in a certain direction + X attack.

For the torso armour, use a running attack followed by the X button. A few of these should see the armour go.

Finally, for the lower armour. Use an attack while holding down, either the X or Y button, and hope your opponent blocks low.

As people have already mentioned, Tower level 11 is the place to be. For equipment, I used:

Head: Vane Mask
Face: Japanese Eye Patch
Neck: Prayer Beads
Shoulder: Warthog Pauldrons
Underwear: Chain Mail
Upper Body: Changpao
Arm: Hero's Gauntlets
Lower Body: Warthog Fauld
Ankle: Bandages
Leg: Warthog Boots

I did it with Maxi, but if you want to use Mitsurugi (as per Gdinut's solution) I'd use Damascus Sword as a weapon.

This set gives you 116 attack, 138 defense and 180 hp.

And also, don't even bother to try it on the first lady. Just kill her and try it on the Cervantes or Taki style opponents.

another easy way to do this is to do a mutiplayer (i did this with a friend over xbox live rather than one console that may make a difference) match so you can control how the opponent is blocking set the match to max amount of rounds and most time just to play it safe i find the legs seems to take a while to break (i also found playing regular mode rather than special helps just to get rid of any abilities that may hinder progress) i find best attacking character to use is yun-seong and follow repetitive pattern
high armor hold forward and press x
med armor keep hitting y
low armor crouch and use b (try and pin them to a corner here or you keep knocking them out of your attacks reach)

Create a Character with Mitsurugi's soul, set it with low attack, high defense and high hp.
skills really dosent matter i placed hp burst.

go to floor 11 on the tower of souls and pretty much spam these moves. I got it on my second try.

High armor - X, X
Middle armor - Y, Y
Low armor - Down/Back+Hold X


i need to add one more thing, try doing this when youve already unlocked a few armor packs so you have better gear.. if you try this as you put in the disc and have no armor packs unlocked then it will make this a bit harder..