It looks to me like she’s wearing a yellow dress under the pink coat. You can see the hem of the dress in some of the pictures. I’m not terribly fond of yellow shoes, but they make sense here. I agree that the coat looks like a bathrobe, but that seems to be the style right now. I’ve seen a lot of them on various fashion sites. The soft pink is a popular color now too. Melania has good taste and generally dresses very well. I’m not keen on this particular ensemble (what I can see of it) but she is on trend.