I've recently done a quick reassessment of everything in my closet, as I try to do every few months, and I've got a little 'business/conference/just-in-case' capsule hanging in the back that I usually ignore. It consists of one suit and two additional blazers in suiting fabric (was three, but I pulled one out for donation already). Everything fits, but because I work at home and live in casual central, aka Silicon Valley, I rarely wear any of it. Even at conferences, I am usually fine with pants-that-aren't-jeans and a nice top or sweater with shoes-that-aren't-sneakers. So I wonder if I should keep these items, update them just in case, or just get rid of them and plan to do some frantic shopping if I ever have to, say, go to NYC to meet with a big publisher. Nothing is horribly old or dated - it's all in the 3 to 7 years old range and in good shape.

Some questions:
1. What is the stylish length of blazers right now? I know that boyfriend blazers (low hip to mid thigh) had a moment a year or so ago.
2. Is there any way to wear a suiting-fabric blazer with a smart casual outfit and not look like you haven't kept up with fashion trends since the millenium?
3. Aside from folks that work in conservative fields, is there really any need to have a suit or blazer these days? (I know this is going to be regionally influenced, but even in talking to relatives in the more conservative midwest it doesn't seem like suits are really a thing for women now at all.)