Willard814
Yellow Belt
I don't think you can say that necessarily. 100% cotton means that is what the garment is constructed of. It could have been coated with something as new clothes often are. Or, it could be transfer from something else, which is actually what I think it is.
I washed the gi by itself so there is no chance something rub off in it. I am very meticulous about my laundry and clothing and I know what melted plastic looks like per the fabric test link decepticon provided http://www.martialtalk.com/forum/member.php?26394-decepticon( http://quilting.about.com/od/fabrice.../burn_test.htm ) I guess you would have to actually see and touch the fabric to confirm that it's plastic.