I'm not quite sure what you mean by "strapless".
All shoulder rigs have a strap or harness somewhere to hold the firearm in place.
Safariland sells a "universal" fit model that you may want to look over.
As for simple shoulder holsters for J frame or PPK type sidearms I'd look at www.Bianchi-intl.com or www.Galcogunleather.com .
A concealment garment or undershirt from 5.11 Tactical or Kramer may work best if you want to avoid straps or buckles.
I thought the OP might have been asking about shirts like the Packin'Tee or ConcealmentT, but I haven't used either, and have not been able to find anybody who could recommend for or against them.
I was asking about products like this (I know, it's essentially a belly-band holster), just curious if anyone is using it and liking it (or something like it).
