The little boys sure do take their clothes off a lot in Ender's Game

I read Orson Scott Card's Ender's Game years ago, and recently decided to reread it. I enjoyed it quite a bit -- it's the ultimate nerd as hero story, and considering the initial copyright is from 1977, he really nailed the way the political blogosphere works. Also, the manner in which supergeek Ender assembles an army of talented outcasts is quite similar to the plot developments in the Harry Potter series.

But the more I read, the more it stood out - - the little boys in the book are constantly taking their clothes off. Here's a sample from the first 100 pages of the book:

"stripped off his clothes and pulled the blanket over him." (Page 65) [six years old]
"Think I should strip and go naked?" (69) [six years old]
"most were somewhere between battle dress and what the soldiers always called their sleep uniform-skin from head to toe." (75) [8 to 11 years old]
"He lay naked on the bed" (80) [six years old]
"Naked, he was about to climb into bed when Bonzo came toward him" (95) [seven years old]
"The commander of Rat Army lay sprawled on a lower bunk wearing only his desk." (99) [11 years old?]

And so on. Did I mention there are two fights in the shower?