Answer:
Polyquan offered its products to both companies, Shirts-A-Lot and Bespoke Tourism, but it only has a valid contract with Shirts-A-Lot.
Shirts-A-Lot accepted Polyquan's offer, therefore there is a binding contract between them. Clothing since its offer was accepted.
Bespoke Tourism didn't accept Polyquan's offer, since they introduced modifications to the offer. Those modifications make the email a counter-offer.
The phrase "... on the condition..." makes the difference.