That one is easy for me to answer...... My MacMillan tank. I just don't like the colors, and only wear it for family gatherings, and less and less, even for that.

If you are talking about workmanship....... a mail-order Fraser that must have been put together with rotten thread, as it kept coming apart. I was almost happy when it go caught in a car door and ripped beyound salvage.

There may be other different criteria, but those two jump to the fore.