Well how big are the rings ? You need to make sure that the rod is small enough to allow the rings to slide easily for opening and closing . I have never actually thought rod size was item thst was in or out it is trully dependant on the size of the rings I like my drapes to be at least 2.5 times the width of the rod if that helps It also is helpful to know what direction the windows face since lining does not stand up well in a very sunny window .

I dislike skimpy rods, specially if you have a large span and high ceilings. I just did 2" rods spanning 12 ft and placed 10.5 ft high for long pinch pleated panels on rings. I went with what looked proportional for the space, material and design of the room/house.

Smaller rods are probably "in" because people don't want to wait for, or pay for, the thicker rods! I had to wait 6 weeks for my hardware.

Patricia, I haven't bought the rings yet - was waiting to decide on the diameter of the rod 1st.

Chispa, you're probably right. I noticed many of the telescoping rods are 1", but I know I don't want those. I hate how the rings get caught on the connection point and don't like the look either. I'm going to experiment with using a splicer to connect 2 larger dia. sections of 2 telescoping rods because it could save me at least half, if it works. Well see . . .

This is a good place for information about curtain rods

https://ironrods.com/