i just make it simple... i only wear my letters around the house or on campus, seeing as i dont think im gonna be drinking at 2pm during poli sci lecture
i usually just dont wear my letters when i go out otherwise. people who need to know im greek already know. and many people will treat you differently if you're greek becuase of personal stereotypes, either good or bad.
i was just looking at a sister's pictures from homecoming, and many of the girls were wearing our homecoming sweatshirts, which have our letters and the letters of the fraternities we did homecoming with, while they were drinking and smoking... i had huge issues with that. i know everyone was tailgating and we were all representing our chapters, but it still bothers me so much.
i do wish we had the rule of no smoking or swearing in letters as well. a large majority of my chapter smokes, and many of them do in letters in the middle of campus, and i just dont like the immage that gives off to other greeks as well as the independents -- especially the freshman/sophomore girls who are still waiting to rush.