Spicing things up..

So my SO wants to try a little "role play" or something along those lines. I do have little nighties that I have recent gotten and he's only seen one. I'm kinda shy but the first time he me in I e it was rather a confidence builder. Anyway, he wants to "role play" but honestly I feel like I would make it awkward or something... Any advice with this? Or anything to help settle nerves?!