Those drapes are likely custom, but Overstock offers two tone drapery panels if you are flexible about colors.

Go to your Sherwin Williams store and ask for help; The salespeople are knowledgible re what goes with what...or should be. Colors are "warm" or "cool"; when side by side they should be the same , warm or cool. What colors do you have in your dining room: is there fabric on chairs, drapes on the windows...use these as a guide.

Check a few sites: https://franceandson.com/, https://www.1stdibs.com/, and https://www.allthedecor.com/decor/, One of the three will have it or probably be getting something very similar soon, france and son can have some issues with shipping, so just ask about it first before you buy, I bought some lamps there and they were fine but had to cancel a table because of an issue with shipping meaning they wouldn't ship large items, but maybe that's changed by now, allthedecor is going to carry similar items and should either have them now or soon...best of luck!