Answer

Is it only your martial arts clothes? If you do not have body odor on other clothes, I would think it is the fabric of the marital arts clothes and your perspiration interacting with each other in some way.

Also, what we eat effects our body odor. Is there any special food you only have on martial arts days? Like a meal heavy on the garlic ?

Once the wringer...agitator..or whatever that thing in the middle of my washing machine is named...stopped working. I did not know that until I noticed my white clothes no longer seemed to get white and was dingy looking. Got it repaired and no more problems.

One other thing is that some synthetic clothes are much harder to clean. Is your martial arts outfit 100% cotton? If not, you might want to invest in something that can be washed in hot water and that bleach will not harm.

I found one web site that might be helpful.
http://www.focusonstyle.com/sniffingaround.htm

I hope I have been helpful in some way. Good luck!