When my precious niece passed away last January, I told her daughter (12 years old) I would make a memory quilt for her, if she'd like. My daughter and she were going to go through her quilts and decide which shirts they would like in them. My niece and my daughter were very close. On the night they were going through her clothes, I had a conflict and couldn't go. I told my daughter to pick out cotton fabrics. Well, she did - but most were cotton knit. These were the prints my great niece wanted. I would like to know, if I put an iron-on interfacing on the back, would I still be able to use them. They gave the remainder of her clothes to Good Will. If so, what would be a good pattern to use? Thank you.