lol I have to agree with you on your observation about sweating through to one's hair. I'm like that, and if I don't wash my hair pretty much every day I end up looking like I haven't bathed in weeks--lank, greasy, stringy, yuck.

I'm not sure so much pure skin tone would show through, even if it's pale/white silk. You might want to try wearing an actual silk shirt and douse yourself and/or get sweaty for reference purposes.