anglais vers français Marketing Textiles / vêtements / mode Corset

This is part of a corset description. In this context, a "modesty panel" is an extra portion of matching fabric that is sewn onto a corset, allowing to cover the skin behind the rear lacing.
http://romantasyweb.com/Merchant2/merchant.mv?Screen=PROD&Pr...

I found a few possibilities for French:
1/ Une modestie
2/ Un panneau de fond
3/ Un panneau de modestie (but I'd be tempted to think that "panneau de modestie" is just a very very litteral translation of the EN expression...)