u/sffixated

I'm looking for a sewing pattern like BHLDN's Willa Jaquard maxi slip dress, specifically with this same type of shoulder-wide cowl neck. No attachment to the cut-out back. So far I'm finding tons of halter, boat, and spaghetti strap cowl necks, but no styles that cover the shoulders fully, so I would also be happy with some advice on the correct term to use!

Second pic is of me in a poorly-fitting version of the same dress. I wish I could just buy the dress, but my top and bottom halves are different sizes and I'd end up having to do a ton of alteration anyway. Might as well make a giant project out of it instead, right??