Looks like it. Been also looking for the perfect green tweed, but the one you're getting made up may be it. I'd rather have a more solid-y dogstooth/gunclub. That one a couple swatches behind it looks nice.
To be honest I have no idea. Got it from Yorkshire Fabrics, who AFAIK are simply merchants. Feels like shetland. It'll probably snag like crazy. Not dense at all. Been looking for years for the perfect brown tweed with green and red/orange, and went bonkers when I saw it. Should've ordered a sample but I'm glad I took a chance.
I agree with you on all counts, G, but the onslaught of clueless color-lovers are often the worst offenders and blithely walk out the door looking like a clown exploded on them. Better to play it safe and look possibly boring but overall pleasing than to reveal one's ignorance.
Fortunately, most colors generally seen in classic menswear are appropriate for all seasons: blue, brown, and gray. There are definitely bright pastels for spring and summer, and muted, dusty hues for fall and winter, but I would focus on the ones that are obviously seasonal, and integrate one or two with classic menswear colors.