main reason:
gun retention .. I can swell up and make my belly look pregnant and nothing can get grabbed out of or fall out of my IWB holster. .... don't ask me for a picture
If I was on the ground in a Trayvon Martin situation or this situation http://www.myvalleynews.com/story/65384/" onclick="window.open(this.href);return false; ... He can't get my goods.
I wear cargo shorts and Tee Shirts ... and guayabera shirts
Glock 26/19 or big XD45 all conceal just fine.