you can use the fitting room.  bring your posed figure as goal.  don't zero.  bring your conformed clothing as object. don't zero pose.  Don't run simulation just his spawn prop.  You now have a dynamic copy of your conformed clothing.  parent the new object to your figure's hip.  in cloth room constrain any parts of the clothing you want to act as confromed and create a dynamic group for any part you want to simulate.