In quilting lingo, a flimsy is simple the quilt top only. The term "flimsy" in general contexts has negative connotations (weak, insubstantial, easily damaged, poor, fragile, lame) and for that reason, many people (myself included) shy away from the term. I think the only synonym for 'flimsy" that I think of as positive is "light". A quilt top IS light before it gets sandwiched, but that's not enough to sway me into liking the term. Because, after all that work, I like to believe it's anything but insubstantial, poor, fragile, or lame!