Encouraged by the success of finding DH one decent-fitting suit at our Goodwill, I have continued to go back every few days over the past 2 weeks, and have found him 2 more suits, also $10/each. I also found him a decidedly more expensive but also much nicer suit on clearance at the Banana Republic outlet store, for $85 which was still a great price. All told, after alterations and the dry cleaners, we scored 4 men's suits for less than $150. One suit needed to be hemmed which was $12 at the seamstress, since the original hem was longer on one leg than the other so I wasn't confident I could match the lengths. Another suit needed the pants let out which I was able to take care of myself. Then the 4 thrift store suits needed cleaning, but our cleaners only charges $2.25/item, so that was only $20.
I also found a couple things for me: an Old Navy winter coat, down filled, reversible, for $4 at Goodwill, and a red and white tweed 3/4 sleeve blazer for $16 at Banana Republic.