Pointless Social Commentary

"Why is it that, as the female characters on 'Zim' get older, their clothes stay the same size?" This question occured to me one day as I was browsing this site, looking at pictures of Gaz and Tak. As I looked at them I noticed that most of the time whenever they were pictured as teenagers their clothes were always either so tight that it's a wonder they could even breathe, or really freakin' short and barely even there. I just wondered why they never bothered to buy bigger size outfits as they aged 0_o
This little cartoon is not intended to offend anyone, cause a lot of people I know depict Gaz and/or Tak this way and they're always good drawings, and hey, if that floats your boat then fine. Even I've done some sexy-type pictures of the characters, but my beef is I never see Dib or Zim pictured this way. They're always pretty much fully clothed and don't have every part of their anatomy outlined in tight leather. Why is it always the females who get sexed up like this? It just irks me a bit. But it's just my opinion, being a female myself and all *shrugs* Well, whatever, take it or leave it. Or just lighten up and laugh at it, okay?