Making socks or stockings by yourself is a good exercise :-) Load the character you want to get dressed. Export the parts that shall become clothes (thighs, shins, feet, toes in this case) as obj. Now you can import this into a modeller like Wings3D, scale and modify it etc. Import it into Poser again, go into the setup room and load the skeleton of the original character into it. Then, delet all body parts that are no longer needed, like fingers, eyes, head etc. Now, you have a figure (the stockings) that can be conformed. To be honest ... I have done this several times, but when I conform such clothes to a character the bending of the joints changes in a strange way. I don't know yet why, but of course this can be fixed manually by bending and scaling. So, this simple method is not perfect, but a nice try.