Re: Harris Tweed, I only pick them up anymore when they have a size tag...and a lot of them do not. Then of course weeding out the ones with any moth damage, I end up buying 1 out of 15 or 20 I come across. They tend to crop up around here (the South) in batches - see them in spades then gone for 6 or 8 months.
You must be near the south as well, to scare up a Muses shirt. I buy Gitman for myself when I see it and it fits; only Gitman Vintage to flip.
The red tag Tyrwhitt is probably the Sea Island Quality Cotton or whatever they call it now - typically among the more expensive of any of their shirts, and a nice find for CT stuff. Bonus if it includes the brass collar stays, which they usually do not, even though they all include them when bought new - people keep them when donating.
Atlanta as well, but don't worry I'm not really any competition for flippers. I go once a week for a few hours Saturday mornings on different routes close to home, mostly as a stress reliever. Yeah the GB for Muses I thought was a neat quasi-historic thing to have - as mentioned it has some weird fabric damage on the back right at the bottom (and on the *back* of the shirt, not the front), so it won't show when worn. I was thinking purchasing non-my-size-items strictly to potentially start trading on here as there are some items that I know are going to be very difficult to find in my size and so trading through this community will be easier.
Only one shirt in this particular batch still had the collar stays, one of the Brooks Brothers and they are only plastic (but with a nice silver BB logo )