Purple sounds like it could be a very versatile color, esp considering the colors you gravitate towards, Tanya.
I admit I have way too many coats. A lot of them don't fit me anymore, since I lost weight, so I am in the market for maybe just one more this year!! I justify my coat collection on two ideas:
1) It's boston - it's cold!! we live in coats most of the year. And I hate being cold! Hate it!
2) My DD's are about the same size as me, so we all can and do share and swap. Therefore most of the coats in my closet do get ample enough wear, I couldn't really prune too much out.
The only coats I don't allow my DD's to borrow, are my leather jackets. Those are hands-off.
One of my favorite Fall jackets is a winter white/beige plaid cropped peacoat, from BR a few seasons back. It is the kind of coat that you really do have to match what you wear underneath. It works best with jeans, winter white slacks and skirts, black, and brown pants.
Last Fall I fell in love with a Jcrew 3/4 sleeve cropped swing jacket, in an orangey red. I wore that jacket all the time. But again, it is the type of jacket that you do have to pay some attention to what you are wearing underneath, or it will clash. But it went with a lot of Jcrew stuff I had last year.
I also got a lot of use out of a black 3/4 length Elie Tahari puff coat. Has an oversized puffy collar you can flip up to keep your head warm, and the bottom has a balloon hem. Sounds like it would be overwhelming, but it's very tailored. Very cute coat - kinda like a high fashion version of a puffer. It wasn't as warm as I would've liked, but I wore it quite a bit, especially because it was loose enough I could wear it over a blazer.
I debated about a North Face jacket.... I liked one I saw that was very long and hooded, but not too puffy, and it was really really warm.... but I just couldn't
get past the logo on both front *and* back. My DH said it looked from a distance like bird poop. NF makes a great product, but WHY do they have to put logos on their coats???
For wearing over skirts and dresses, I have a long black wool BR coat that's about 4 or 5 years old now. It has a nipped in waist, and has a beautiful leopard print lining. It goes past the knee. It's not a petite, so it probably hits too low, but it works. It's just that it's a very very heavy coat!!! Which makes it a pain when traveling and it has to be carried. I would love to replace it with a cashmere coat. Had my eye on those last year, but they are so expensive.