I take it back!
If you feel comfortable wearing your letters/crest on your back, then by all means--
Do yo' thang, don't be scurred! 
I just choose not to.
But, don't listen to me, y'all--I'm one of those Sorors who loves the call, feels the DUCK, and upholds COLEMAN LOVE to the fullest (and won't back down when challenged/confronted about it). So what do I know, right?
Needless to say, if there's nothing in writing against rockin' letters on your back, then there musn't be anything wrong with it. I'd never say anything to a Soror who does it since it's not wrong by official P&T standards. It's just not something the411 would do. To each her own, Lovely Ladies!
And (of course) I'm Out!
