Thanks, all of you, for the caveats and cautious affirmations.
One other thing I should have mentioned is that even though I've been a grown up for a while now, this is the first time I've assembled such a "grown up" wardrobe. Most of my adult life, I've been in an academic discipline where rolling out of bed to your desk and on to campus is the norm. I once texted a friend a pic of the crowd for an exciting, famous speaker at the biggest annual conference in our discipline. He replied that it looked like a Dungeons and Dragons meet. So, besides not losing my head and buying all the things, I also don't want to make the kind of sartorial mistakes an intern might. That blue Talbots fit n flare dress was one of those "OMG, I'm losing weight" things Suz cautions against. I couldn't wear it at all, then I could, now it's a bit big on me, and depending what kind of office I land in, it may be a $30 mistake. This isn't exactly the one I have--there is no lace on mine, but otherwise I think they are the same. I need to learn things like what makes a suit more suitable for the "ladies who lunch" set than for work, and what differentiates a blazer from a suit jacket.
Rachylou, your comment reminds me of a friend who likes to point out that you haven't saved anything at all if you buy something you wouldn't have gotten otherwise.
I think a big danger in picking things up along the way will be disorganization. I want all the individual bargains add up to a coherent wardrobe of items that work and play well together (even at work, I don't want to be totally somber, just appropriate in my joviality).
Meredith, the tank tops haven't arrived yet. I may post when they do. I've never heard of the label for the black tank top before. Have you?
If I see what looks like an incredible deal on something like a charcoal suit or blazer, I may post about it here and get it, or I might just listen to feedback for next time. That's the sort of thing I should be especially cautious about. I really like the gold dress in my finds, think I could wear it with black blazer, pumps, and hosiery in a conservative environment, but for right now, I have a black knit cardigan from BHWM that I could wear with it to give me sleeves.