Anonymous wrote:If they are designer pieces worth thousands of dollars - yes. Otherwise, no, it takes someone who knows what they are doing to do that right, and they are not cheap. With that much of a weight loss you are likely looking at opening all the seams, basically reconstructing the pattern in your new size and putting it all back together. It’s not a job for people who do $10 pants length alterations.
If you are going to go for it, look for someone with an experience working for a high end custom tailoring shop or a theater costume department.
PP, adding to the above - if they are unlined coats with a relatively simple construction, then it’s a maybe. Start asking around with the coats.