I just realized that a pair of my DH's suit pants ended up in the laundry and have been washed and dried. The label clearly states "professional dry clean only". They are 100% worsted wool.
Have you had your husband try them on? I think the pants are a goner. To felt wool, you need heat, water soap and agitation. I think you hit all of those.
FWIW, my old work uniform used to be 100% wool... for a long while, I did the whole "Dry Clean Only" thing, and then, I started washing it. It looks great, feels great, and would still fit great!