I am a fan of "retro" clothing for the normal reasons, they are usually well made, its out of current style so it never goes out of style, its a Harris Tweed pure wool jacket that is almost a good fit but its designed for someone with a bit bigger girth that I am. My question for someone who is versed in jacket design and modification is related to the viability of modifying it by moving the front buttons about 2 inches to get the waistline about right. Looking at its construction there is no way I would want to try and modify the side seams as its fullly lined and the inner pockets are sewn through the lining.

This is the label inside the jacket to certify that it is made of Harris Tweed.

This is the front view of the jacket without the front buttoned up.

This photo shows where the 2 buttons are which is fortunately very close to waist height.
What I had in mind was removing the two front buttons, they are a leather finished button with a rear loop, and placing them about 2 inches to the left and narrowing the waist in the simplest manner I can think of. Generally the jacket fits OK, shoulder slope is a bit high for my square shoulders but it fits well enough, sleeve length is fine and its wide enough across the shoulders so that I don't tear out the sleeve seams. About the only complaint is the Scottish wool from the island is a bit scratchy so it will need to worn with a collar.
Any advice here would be appreciated.