Gotta have a body for that though.
Whatever the issue with the clothes, I think it was totally practical.
He had just killed his wife, and his life and freedom were on the line. Time was of the essence, and any symbolism or need for degradation would probably have been much lower on his list.
He already got his revenge when he saw the terror in her eyes as he (likely) stabbed her to death.
No reason to make this any worse, especially when it seems unlikely at best. He had a body to get rid of, and evidence of the cleanup.
Priorities.