Thank you so much for your feedback all! This was a very eye-opening exercise for me and I learned a ton! Here's how I'm leaning:
The two short jackets (2 and 8) I'm keeping for now - I will wear them with dresses and see if I like them that way.
#1 had mixed reviews, but I think it looks dressier in person than it does in the photos - certainly it's the highest quality piece in terms of fabric and construction, and it's staying, at least for now.
#3 is ponte fabric and few years old, and will be demoted to casual and travel wear. And I will change out the buttons as suggested by Deborah; I think that will make a big difference.
#4 had mixed reviews - generally positive although a few of you mentioned the grey color wasn't they greatest on me and one person didn't like the fit/shape. This is one of the older pieces, and if I don't wear enjoy it wearing this fall, I will donate it.
#5 was generally well received - everyone loves a good pinstripe, and this one is also staying. However it's my oldest blazer (at least 15 years old), and starting to look a bit worn - it will be used primarily casually.
#6 I was surprised at how many people commented favorably on this marron drapey number, as it's the one piece I had already mentally consigned to the donate pile. Every time I pull it out to wear, I put it back. I just don't think it's that flattering of a cut, and the color is too warm for me - compared to the cooler purple of #10, I think it makes me look rather florid/flushed. It's going.
#7 and #11 (the teal and blue) are my favorites, and were universally liked. I think I will wear the blue one my first day with a column of black.
#9 - the long navy blue blazer - this is one of my favorite blazers, I wear it all the time, so I was taken aback that it was universally disliked and deemed unstylish. But I do see the point - I will keep it for now - it's a useful piece of light outerwear for Fall - but a new navy blazer has moved to the top of my shopping list.
And finally #10 - the new purple blazer - it is indeed too large and I will return it. I'm seem to remember that there was not a smaller size, but I will check when I take it back.
Once again thank you for your time and input!