The straightforward answer to your question is 'Yes' but with a few ifs, ands, or buts. First of all it's not likely he will be wearing his suits right after surgery when swelling may make a difference.
Most patients enter a rehab program for a short time and find gym clothes or sweat pants much easier to get on and off. Loose fitting or pants that stretch will be helpful during
By the time your husband re-enters the work world his regular suits should fit him once again. Total body weight gain/loss may occur anytime someone is off work or has had major surgery. This weight change will not be related to the size and weight of the joint implant.