Depression is certainly to be expected and nothing like dapper new threads to make anyone feel like living again. My tailor friend Bernard has these suggestions for flattering a tall thin masculine figure. One color is slimming and adds height. So if your husband is tall and lanky, and looks great that way, a shirt, trouser, and jacket in the same color family will make him look stronger. If your husband likes a complementary ensemble, he can add bulk with a light color trouser and dark color shirt with complementary jacket.
Ties are always acceptable.
If your husband has lost a lot of weight in his neck, he may want to wear a closed collar with a tie until he gains some of his neck weight back. He may also wear a stylish ascot with an open shirt if that is his style. If he needs to look broader in the shoulder, try jackets that have a bit of contour at the waist and a little padding at the shoulders. A note on jackets. A too-short jacket will make a person look too short.