Yes, you can. I bought the 100% polyester fabric shower curtain liners from Superstore and they are still perfect five seasons later. Mine are light grey so the don't look dirty. I throw them in the washer once or twice a season to freshen them up. Keep in mind that they are super light weight so you will need a method to weight them or tie them down. For me it was easy, I just binder clips them to my  cable deck railing. Since they are polyester, they have never gotten moldy or mildewed - but I am in a low humidity province.

I wouldn't want to cover up that lovely new trim either. Would inside mount blinds interfere with the window mechanism? Looks like that might be an issue? I might just get a light gauze fabric, or sheer curtain, cut & hem it to fit, and hang with a pressure rod just at the top of the window. Add a bit of cording or ribbon at the top corners - use that to pull the curtain open and closed as needed. It won't block light a lot, but will diffuse it to reduce glare and heat from setting sun

Thanks for responding. I have a bay window with three arched leaded glass windows (the two side windows are each 22” wide, the center window is 62” wide). I plan to have a continuous road hung high with only a single panel on each end. The panels (when I finally get them) are hung via grommets. I don’t want the black rod spanning the center window to appear obtrusive against my Wool Skein wall color. Thoughts?

To train my drapes (which I make myself) I hang them up, open the drapes all the way over to the side. Then I staple strips of paper (about 3-4” wide) around the pleats after I’ve got them hanging how I want them, in about 5 places down the length of the drapes and leave them there for 4-5 days. I always line my curtains and use weights (or slip a coin into the bottom corners). I also use buckram (encased) at the top to give some stability before they are pleated. . The curtains are ironed throughout the process, but the pleats are not ironed (after they’ve been pleated). I use a pleat calculator to determine how many pleats I need. I always use 2 1/2 x the width of the window for fabric fullness. I use the long hooks (2 1/2”? ..it’s been a while) which gives structure to the pleat heading (but it depends on how ”deep” your header is). I also make them so they overlap in the middle, which requires a special overlap type of “ring” - can’t remember the name. Your drapes look nice !