You're an adult. You like to keep things classy. You like to rock your 3DS in a pouch that not only keeps it safe, but does not scream "I GOT THIS AS A PREORDER BONUS FROM GAMESTOP". You should, then, look at Watefield's 3DS cases.
The classy bag company is offering three takes on a 3DS protective solution: a standard flip-top case, a "suede jacket" and a bigger, fancier travel case.
All that nice comes at a price, though: while the jacket is only $11-15, the case is $39 and the travel case $49.
You can check out Waterfield's range at the link below.