Indications: When is underwear/padding appropriate? What problems can it solve/disguise?

Materials: What should you use?

Methodology: How do you apply the materials? Specify order, technique, etc.

Didn't know what it was supposed to look like when I was done (still not sure - examples?). I really was working blind, with 1" Dacron, quilting muslin, poly thread, and a curved needle. I did it in layers, stitching everything directly to the sofa as I went along (trying to soften channels on the IB and arms, and cover/smooth exposed decorative wood).

Also, a time frame - I know I took w-a-y too long, and I still wasn't happy with it.