Budget Friendly 3 Stylish and Functional Bags for Everyday Use, Step by Step Tutorial 

yes kind of hard cloth called buckram, used in shirt collar

Interfacing is a stabilizer that gives added structure support to your other fabrics. There are many types of interfacings. The type of interfacing that she is using is an iron in interfacing (it has dabs of glue on 1 side). It looks to be. Medium weight interfacing.

Thanks for the reply ❤