About 30 years ago I made a quilt for my first GS. I had bought some new calicoes plus I had some pieces of clothing to fill in. The calico on the back is like new, but some yellow calico in the quilt has come apart. The same with the clothing in the quilt, some is still in good condition, some have come apart.
When I made this quilt, I couldn't afford all new fabrics, but it was bright and colorful for years. It has been repaired a few times, but short of replacing some of the pieces it has held up o.k.
I have learned so much about fabric and sewing since then. I still mix old and new fabrics in some quilts. I am laying one out now that is all from used clothing and is cotton polyester blend. I find they hold up well in quilts...
Don't be afraid to experiment. That is half the fun to me!!
Welcome to the wonderful world of sewing and quilts!!!
Ditter