I agree with checking with Ebay, Craigslist and Freecycle. Of course, there may not be something now, but keep checking. People post new things all of the time. Wearing your husbands pants is not bad, I use to do the same. Right now I will wear his pj pants, sweats and track pants. If you are home, it is no big deal. It will not last forever, you have a goal in mind, and you will achieve it soon!
I understand your frustration, I started my healthier lifestyle 3 weeks ago, and don't want to spend too much money on clothes for my next size. Especially since I do not plan to be that size for long. How about purchasing sweat pants? That is something you can wear for a while. Right now I own 2 pair of jeans, and 3 nice shirts for days I go out, out (which is not often). Otherwise I will wear track/sweat pants. You mentioned finding pants that are too long. You can always cut and hem them with non sew tape (use the iron to infuse it). It holds very well. Nothing will take that hem apart. LOL

Shirts can go awhile longer, but they also have some pretty good deals on blouses and t's. I'd just dress them up with jewelry and a scarf or something. I refuse to ever own a pair of sweat pants again... I do wear some of my 17 year old sons jeans he out grew in Jr. High...lol I'd been saving them for son #2, but decided to claim them for myself.