Try loading the V4 figure with the required morphs injected.

Load and conform the clothing.

Go the to V4 pose folder and find the magnetizing poses.  Magnetize the clothing. 

Then apply the A4 morphs and fits if there are separate fit morphs for the clothing.

V4's mesh has a ton of magnets attached and they are supposed to help with fits.

Do you have the use scale box checked?  This helps as well.