Another by-product of arch supports are a looser heel fit. You are lifted out of the shoe by the thickness of the arch support. Then because the arch support comes up behind the heel, it creates an air space between your foot and the shoe. These two things make your heel fits looser. One of the reasons that dress shoes and arch supports do not normally mix.
Most patients can get by with a dress shoe for temporary wear without the arch support.
You know, the house to the car, into the restaurant, theatre, church or event, then back to the car and home. However, dress shoes will not work for doing the mall, sight seeing, working on your feet all day etc. Some women are wearing the thinner nyloplex, laminate and leather arch supports in some of the Clinic strap dress shoes like Rena for temporary wear. Generally, an orthotic will add one to two widths to your normal width, unless you are in an oblique toe, which run two widths wider than what they say anyway. If you only have an orthotic on one foot, you will need an innersole in the other shoe to balance the two feet.