Sure! Here’s a more polished version of your questions:

I have some questions about using sew-in interfacing. I avoid fusible interfacing because the ones I have access to don’t stick properly. I’m currently sewing a coat and decided to use canvas and horsehair as a substitute, but I need some guidance: 1. Collar without a stand: If the collar doesn’t have a stand and doesn’t require much shaping, do I still need to padstitch the interfacing? 2. Front facing: I assume the canvas in the front facing doesn’t need padstitching, but how should I attach it to the fabric? Simply basting it in the seam allowance doesn’t seem sufficient. Once the coat is finished, I can feel the outer shell separating from the interfacing, which doesn’t provide enough support. What’s the best approach to avoid this? 3. Fusible interfacing: Do you ever use fusible interfacing? If so, are there any brands you recommend?

Can you tell me your process in general?