I know there's some folks that like nappies to make a noise, but I need them to be as quiet as possible. My wife knows about my wearing but doesn't approve of me wearing around her and I've twice been given away by supposedly quiet items.
First time I was wearing a Drynite under my pyjama bottoms and passed her on the stairs while she was bending down tying her shoelace - I was unlucky here, her head was level with my bottom!
Next time I was wearing Always Discreet pants, again under pyjama bottoms and she heard me when turning over in bed - so much for discreet.
I think even clothed backed are noisy because they all need the waterproof plastic layer. Although Underjams have a kind of rubbery waterproof layer - and that is genuinely silent. Possibly Tena Protective Underwear Discreet as they seem to have a rubbery layer as well - although i'm not sure if this is just to make the pants fit / stay up, rather than waterproofing.