I sew drapery and roman blinds...I made the Roman blind in my family room using silk, blackout and a layer of interlining in between...there are many many types of linings and interlinings available ..it just depends what you want to do..and it really helps the heat/sun...
Interlining is like flannel...in England they call it bump..but it is thicker..I have just recently seen it sold here in Canada and it looks beautiful to add to drapery for warmth and also body...there is also a new product called Thermal Plus All in ONe Blackout...which is the lining with the interlining flannel bonded together...saves times in construction...
Like I said there are so many..I have 3 or 4 sample books of linings alone...