Originally Posted by Joel_Cairo
those buttons are functional though, gonna be a bitch to alter.
The entire cuff (with buttons attached) is removable. This fairly easy operation is more akin to shortening a shirt sleeve than a coat sleeve.
While the cuff is removed from the sleeve-end, simply shorten the sleeve-end the desired amount. Open the sleeve seam to extend length of seam opening and adjust sleeve taper to match the cuff's cuff-to-sleeve diameter and re-attach the cuff.
Since everything is being taken-in or shortened, none of the original marks will show as they do on (waxed) cotton when it is lengthened or opened-up.
Don't make the sleeves too short! Nevertheless, they do appear too long as-is.