it entirely depends on the cloth. if the cloth is designed for a ZERO pose start, then, unfortunatly you must start with a zero pose. of course there are work-arounds.

if you are doing say an animation, and the first frame is not a zero pose, the easiest way to get dynamic cloth to work in this situation is as follows :

Save the pose of the character at Frame 1 to your library.
save your current scene, and open a new scene.
add the character and the dynamic cloth you want to use.
set frame 1 to the zero pose, and frame 30 to the pose you saved to the library.
*if your pose you loaded is not in the same position (different XYZ coords of either the hip or the body) go back to frame 1 and reset the hip/body translation to the same as frame 30.
in the Dynamics room, set stretch/shear/fold resistance to 50 and run the animation.

after the animation is complete, you will have the dynamic cloth fitting your pose at frame 30. Set your current frame to frame 30.

click file->export->wavefront OBJ

export the dynamic cloth object only.

Load up your original scene/animation and then import the wavefront OBJ you exported. untick everything but UNIFY Normals.

if you did everything right, the dynamic cloth will load into your scene fitting the pose in frame 1 exactly.
from here you can continue to render your scene.

TemplarGFX
3D Hobbyist since 1996
I use poser native units

167 Car Materials for Poser