Haven’t put it on the duvet yet so can’t comment on fit but it looks nice in the package - the blue isn’t as dark navy as I would have liked. It’s more like a “denim” colour/look.  The white part is thin with a waffle texture.  It will work for my purposes I think but it does seem rather thin so if you have a duvet with any colour on it, the colour might show through the thin white portions of this duvet cover