Wow, just this month I finished memory quilt with just about all the fabrics you described, silky nightgown to denim and corduroy slacks, knit tops, curtain pieces, quilted jackets. At first I was very dismayed that it would be even possible, the person who requested it didn't sew & had cut up many of the pieces into odd shapes. But because of the personal connection I buckled down & did it simple patch work style, some rows had pieces sewn together that were approximately 4 x 4 inches, some rows were all piece approximately 5 x 6, etc. It came out very primitive looking, the quilting was not my best (free motion meandering) but the recipient loved it. I found out from another person she couldn't stop raving about it & wished she had asked me to do 2, one for herself & one for her Dad (it was her late mother's clothes), this one is going to her Dad for Christmas but apparently she can't wait that long to give it to him.
So hang in there, do what you can, it will be precious to the person receiving it, especially if they don't sew so won't see all the mistakes!