we did it like this:
one person receives payments from either one how,s in for a shirt,
make a shipment agreement with the receiver/arranger
this person then wait till everybody paid up.
then he orders.
and then when the shirts arrive he can notify everyone.
and further distri can go on since shipmentprice is pre-determined
btw we had ordered 20 shirt with same sort of print on the chest,
and diff nicknames on the sleeves
and all the colors of the rainbow too