Suits change according to fashion too. Most of us just don't notice and walk around happily oblivious to the hipsters/fashionistas judging us and sniggering between themselves.
When I bought my wedding suit, my fiancee dragged me to multiple shops and eventually had a lengthy discussion with a Saville Row tailor over whether to have one button or three buttons (two? I have no idea), as she believed one button suits would be coming back into fashion on the higher end, but most of the brands did not offer one button suits at the time. She was right. She had similar opinions about the cut...
When I bought my wedding suit, my fiancee dragged me to multiple shops and eventually had a lengthy discussion with a Saville Row tailor over whether to have one button or three buttons (two? I have no idea), as she believed one button suits would be coming back into fashion on the higher end, but most of the brands did not offer one button suits at the time. She was right. She had similar opinions about the cut...