A sample of the 21 rules of race t-shirt wearing:
"2. Any race tee, less than a marathon distance, shouldn’t be worn to an ultramarathon event. This goes double for the wearing of sprint-tri shirts to Ironman and Half-Ironman events. It simply doesn’t represent a high enough "cool factor " and sends a red flag regarding your rookiness. It's like taking a knife to a gunfight....Be sure to read the whole post for the full comical effect! I'm not sure how many of these rules apply to t-shirt quilts, but I'm thinking at least half do.
6. A DNF’er may wear a race shirt if... the letters DNF are boldly written on the shirt in question (using a fat Sharpie or a Marks-A-Lot).
20. This next one is a big one, and has something to do with the need for more good taste and asthetics in this sometimes ugly world. Never wear a shirt that is so old, thin, and threadbare that you can see the color of your nipples or chest hair through it. This seems to be just a "guy thing," especially and old-codger-runner-guy thing. Here's the test guys: if you're too scared to machine-wash your 1978 Tab Ten-Miler shirt for fear of it wafting down the drain as meer subatomic particles, then it's probably too transparent to wear in public..."