That dress sounds lovely, and like a perfect combination of style and comfort! But it has stumped me in my searching of the database, to get a combination of all those elements. A lot of shirred patterns have all-over bodice shirring, or at least a full waistband.
Your best option might be to find a loose-fitting dress pattern that has the shoulder gathers and neckline that you like, then use a tutorial to add a shirred panel to the back. Here's a good tutorial I found, but there are lots of others out there, by different designers and bloggers. The main thing to keep in mind is that the shirred portion is a separate panel of fabric, so that the ends of each line of stitching can be hidden in a seam. https://blog.closetcorepatterns.com/how-to-add-shirring-to-just-about-anything/
For the dress, you could start with one that is either loose or has an elastic waist, then use the shirring instead of the elastic. Here are a few ideas I found, with different neckline and sleeve options:
Rhapsody by Love Notions: https://www.lovenotions.com/product/rhapsody
Zadie by Sew Over It: https://sewoverit.com/products/zadie-blouse-pdf-sewing-pattern
Glow by Cris Wood Sews: https://criswoodsews.com/products/glow-dress-pdf-instructions-download
One other pattern that you might like is the Charlie Caftan by Closet Core. It has a panel in the front to incorporate pleats that have the same effect as the shirring. https://closetcorepatterns.com/products/charlie-caftan-pattern

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