I do hate to disappoint you, MK, but the shirt is blue. It may appear a bit lavender as I was trying to undo the very yellow hue that the lighting in my living room gives everything, and thus cooled the color temperature.
As for whether this was the shirt I wore to lunch when we had the pleasure of meeting, no - I think that the shirt I was wearing that day was a similarly patterned twill from Lewin - a bit brighter blue, a much more flimsy fabric. It takes a LONG time for shirts to cycle through rotation in my shirt drawers, and it's not been that long since we met.
Ah well - on both counts. I stand by all of my statements about lavender, and I was actually referring to the suit but my ambiguity is now obvious. In the same vein as your statement though, I would now guess it is not.