Modesty panels play a small, but important role in the world of corsets. These humble little rectangles of fabric accomplish several tasks in one go as they sit behind your corset laces. There are also reasons why some may choose to forgo wearing a modesty panel. Not all corsetieres include modesty panels as standard, so be sure to confirm this detail when placing an order.
From a construction standpoint, modesty panels can be made in about as many different ways as the corsets themselves. Generally speaking, they have at least two layers of fabric and some amount of boning or other stiffening. They can be stitched in or left loose. A "floating" modesty panel refers to one that is suspended by being somehow threaded through the lacing.
I generally describe a modesty panel as having three different functions. One of the biggest reasons corset wearers like them is they hide the crease in their skin down their spine that is a natural result of tightening the laces, aka "back cleavage," or a "venus fold." (Isn't that a lovely romantic name for it?) Conversely, some corset enthusiasts, notably in the fetish community, may respond favorably to the sight of the venus fold, as a small, externally visible token of the forces and control of the corset itself. Corsets worn over clothing don't need a modesty panel (though they may still be worn with one), since the garment beneath covers the area of concern.
Tied in with the camouflage effect is the way the modesty panel unifies the look of the corset around the body. Made of a matching fabric and often even including design details such as lace overlays or trims, the modesty panel creates an unbroken circumference.
Lastly, but perhaps most importantly, a modesty panel shields your back from "lacing burn," the friction that arises as you tighten your corset. Though lacing burn doesn't (in my experience) leave any physical burn marks, it is definitely not a comfortable sensation!
Speaking of comfort, the other reason not to wear a modesty panel is because some people just don't find them to be so. I am actually one of those people. I find the additional bulk and boning creates more pressure along my back than is my preference. If you want a modesty panel for aesthetic purposes, talk to your corsetiere about minimalizing the boning and thickness of your modesty panel.
Do you wear a modesty panel with your corsets? If not, why not? What's your favorite aspect of modesty panels?