Advice from a fairly recent convert to home sewing: Batting of any kind does need to be quilted, because it will clump and shift with wear and laundering, or even with gravity over time when hung in the closet. Tacking it to the shell and lining (rather than sewing through). as suggested by several folks above, is a good compromise, since machine sewing through all layers lets air through. Hand tacking is something you can do while watching TV or a movie!
May your trails be crooked, winding, lonesome, dangerous, leading to the most amazing view--E. Abbey