Quinacridone
aka S Goodfellow is 23.03 years old, has been a member since December 1, 2007, has scored 342 submissions, giving an average score of 1.31.
It's not weird, it's just that Threadless used to print guys and girly tees on two different brands, so the colours weren't the same. Denim just wasn't available for girls at the time. When/if it's reprinted they'll be on the same colour. Though it might be brown.
There is a color of purple that could've easily replaced the brown here. bah. Even the kid's... charcoal? Cmon, kids need color. Navy isn't such a rare color to find. Gray, brown, white, and "creme"... colors of the threadless palette make most designs unwearable for me (latter 2 being all too see-through).