Do not size up
"This is honestly a stunning coat and I'm so excited to wear it this winter in New England. I was expecting a thinner coat, but this has stuffing so it's more like a quilted puffer coat. The color is stunning and the quality looks great, we'll see how it handles the winter. One point of caution: I wouldn't size up. I'm pretty solidly in the 2x size and I was concerned there wouldn't be room if I wear a sweater. I'm pretty sure I could wear an entire puffer coat under this and still have room. I'm probably going to return and reorder in my normal size. Don't make the same mistake I did!"