Extending coat sleeves with a cuff

This might be a stupid question but for a coat with a sleeve cuff like this can I extend it if the sleeves are too short? Would I need a tailor to do it or could I just unbutton it?
Screenshot_2024-07-09_at_8.43.02_AM.png
Screenshot_2024-07-09_at_8.46.58_AM.png
Was this page helpful?