The best lightweight visible is French fuse because it is 60" wide I use it for all t-shirt quilts available at Backside fabrics

My friend had silk cushions from when she lived in Maylasia and the silk had started to split, I used ultralight fusible interfacing used for garment making suitable for sheers and silks to stabilise then made into a wall hanging.

Such gorgeous fabrics.
I can't wait to see the quilt you make with them :)

Janelle

Contact Cindy Needham and see what she uses. She works mostly with vintage linens, silk etc. and has good advice and experience. Personally I would make wall hangings a lot of what you have looks to fragile for a quilt that would get any use. Cindy’s contact is http://Www.cindyneedham.com best of luck.