He's already wet, so why not go for wet and naked?? So much more interesting that way.
 
Early season one, he still had such a baby face. Babies make one think of bare bottoms. We missed a rare and precious opportunity.
 
Hooooboy! The pants are already ripped off (what HAD they been up to?) so why not go just a step further and leave him in even skimpier tatters??
 
Because anytime the subject of sunscreen comes up, we should be shown tender flesh that easily burns.
 
*Cough*. No explanations necessary, I assume?
 
He just got some from a Goa'uld, and he's still dazed. He should still be naked, here! It would emphasize the realism and play up his vulnerability!