I couldn't find this documented anywhere, so I think I've found a new (and crazy) glitch in LADX. I was just wandering around after collecting a piece of power and somehow gained the red tunic out of nowhere! I did some testing and it seemed that I might have overflowed some counter for the piece of power, and that slashing two enemies at once after killing many enemies would give you the red tunic.
It's not a sprite glitch, I really did get the red tunic and had the 2x power property! I was able to replicate it several times, so I took a video (it starts after I had killed some large number of monsters):
http://dehacked.2y.net/microstorage.php/info/1321/Redtunic.vbm
(Note that having Bow-wow is probably not a prerequisite, I just happened to have him with me when I discovered the glitch)
I also recorded from the same spot a movie where I killed two different enemies at once and gained the blue tunic:
http://dehacked.2y.net/microstorage.php/info/1322/Bluetunic.vbm
I can see that the blue tunic glitching isn't that applicable to a speedrun. But would getting the red tunic early and killing monsters (and bosses) twice as fast be worth the time spent performing this glitch?
Do people have any thoughts? More investigation into this glitch would be appreciated.