Your suits are beautiful 
They may not be exactly to your specifications, but you still have 3 lovely suits. You’ve paid $270, and when you comparison shop online, or locally within North America, you see that you have a BARGAIN on your hands. Instead of going through the expense of returning the suits to Karachi, maybe they can be altered locally? If you are entirely dis-satisfied with your purchase, maybe you can sell them (online through ebay, or locally) to recover your expense? I am sure that Sanaulla can clarify their stitching policy based on this incident.