You are not going to find those fabrics for sale in any stores. Pottery Barn will have had a staff designer create the patterns, and then commissioned the fabric to be printed just for them. That's how it almost always goes with ready-made things like that. Companies want their products to be unique. In some parts of the world (Los Angeles, occasionally but not often NYC), there are "remnant" stores that get their hands on the ends of the bolts from companies like that, but they're sold in the stores only. And they're not every company (bcs the sheets are made across the ocean, usually).

Your best bet will be to use the fabric as an inspiration rather than trying to locate the exact same. Coaster furniture is Chinese made and shipped by the container load so is likely not something you’ll find in a local fabric store. Check for reupholstery shops in your area. They will have tons of books of fabrics you can’t find at Joanne’s or the like.

Check on ETSY to find this. There are a lot of online drapery workrooms there. They show their fabrics. This looks to me like a synthetic ground with lovely decorative detailing and it will be very difficult to replicate unless you get it from the same source. When I have ordered samples from workrooms on ETSY, they always come from obscure sources in faraway lands with little to no labeling. I think this might be your case. So, I'd scour that site first. Good Luck! Alternatively, you could pick up one of those pinks in a solid perhaps, or a companion print/pattern which I would recommend engaging a professional to help you with the nuances of the task.

And you won't be able to get it ! Beacon Hill is a division of the bankrupt Robert Allen/ Higland Court/Duralee group, Unless it is hanging around somewhere on a bolt? Forget it. All that is left of that bankrupt group is Thibault. Find something else to love.