Attached Link: http://www.poserfashion.net/downloadp5.htm

For that pose you would more than likely need to use a dynamic clothing item. It would be very hard to try and get something conforming to fit around the legs and arms in the extreme positions they are in. Do you know how to use Dynamic Clothing? If not, here is a link. The site has pretty dynamic clothing, and it's free. It also offers a tutorial on how to use the cloth room to use the dynamic clothing. At the end of the tutorial, you need to go back to the cloth room and "run simulation". The tutorial leaves that part out.

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi