Is it possible to have this coat re sized to one size smaller?

It is worth a try, but it will probably be expensive. I would suggest returning it for a smaller size, but you said you don’t want to do that. The good news is that a slightly roomy fit is good for layering during those cold winter months!

It would depend on the material, the lining and the cut of the coat. I’d try a drycleaning place that does alterations and see what they say.

Go to a good tailor and it shouldn’t be a problem. When i lost a lot of weigth and had to have my clothes taken it, there was no problem. Everything from pants, jackets, shirts, dresses. And if they are good, they should be able to tell you how much it will cost before you do it and if they think it is worth it. My guy tells me to return the things he knows won’t work out well.

Does too big in the sleeves mean too long? Or you need the armhole made smaller and the entire jacket taken in? Shortening a sleeve is usually no problem, unless it has to be shortened at the armhole (the area under the arm). Taking in the jacket, it depends on what has to be done. Of the should needs to be cut, it will be expensive and too easy to screw up, I would not do it. If it is just taking in the back a little, it might still be a little pricey, but if you love it might be worth it. Only way to know is to bring it to a tailor. Bring it to a good tailor, you can’t cheap out on a jacket like you can a hem.