I have a lot of experience sizing up lol. Assuming there is seam allowance (my theory is that when KL first lost all the weight himself, there was a bit less in certain garments), a talented tailor can work wonders.Thanks to you and @gracekelly for the feedbacks. My options are to keep neither, either, or both. But as I was trying on the cardigan I think I will definitely return it since the embellishment is heavy and noisy. The 18A jacket is growing on me, but still worried about the long term fit. My experience with boutique tailor is that they can generally size down but sizing up can be challenging.
@chanellover333, for something from 23 Fall Winter, an SA should be able to do a search for you. It might even turn up on sale