Thank you all so much for your fantastic advice. First quilt completed

. It actually went far better than expected and to the untrained eye doesn’t look too bad.
I am going to try to make another one soon so may be back on with some more questions.
First question, I used a polyester batting/wadding from our local craft shop. It fits the purpose perfectly but for my second one I would like it to hang slightly more nicely. Any advice on what inner to use? Bearing in mind it is for my children and hence will need washing. I’ve got lots of cotton curtains interlining, would that be a possibility or not?