Hi Heidi. There are heaps of these type of dress patterns out there, especially among the indie pattern companies.
For me, I’d start with the dropped sleeve bodice, so I’d use either the maritime tee, or the weekend getaway patterns for the bodice (for the weekend getaway, just cut on the Gold and omit the facings) then just drafting the length and forward side seam.
There are tutorials on the Oliver + S website for a forward side seam (Liesl did it to the metro The) and lengthening a T to a dress (school bus T tutorials).
The Building Block Dress Book is also really helpful for these kind of mods.
If you want a pattern you don’t have to alter, have a search on Sewing Pattern Review. Tessuti patterns have this kind of dress shape, as do Style Arc. I can’t speak to their quality, I’ve heard the Style Arc instructions are disappointing.