My office is business casual, though I wore my letters to work for the first time last week via a professional training seminar the Ohio Society of CPAs have every year that we attend. I wore my golf shirt with the letters and "Columbus, OH Alumni Chapter" below it. Most of the professionals are dressed down anyway, so I blended right in for the most part. I didn't meet any Nupes or Greeks at the seminar, though I usually do other years, but at the Convention Center there was also a pastors conference going on, and an older fellow Nupe saw me and we greeted each other and chatted for a minute, so in essence it did pay off to have my letters.
I might have to wear nalia more often (via lapel pins and whatnot), there's an Alpha I work with on various projects and I can't have him one-up me on representing our respective orgs, knowhatImean?