Even if a suit has no wool content, like many cheap and mass produced ones, it will frequently have layers of fusible interfacing in the front pieces of the jacket, and around any vents or pockets. Washing will degrade the glue and the suit will look like absolute garbage.
Even if there is no fusible interfacing used, like in handmade, high-quality suits, the process of suit-making involves shaping the pieces of the garment, especially the fronts where the lapels are and where the sleeves attach to the body, to fit nicely around the curves of the body. Agitation, heat, moisture, and detergent will undo all of that. It has to do with how the garment pieces are handled and stitched during the tailoring process. You can’t re-do all that with a garment steamer or iron.
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