LONDON — Burberry is swapping raindrops for seawater, collaborating with swimwear brand Hunza G on a collection that will land in stores on Monday. The co-branded collection fuses the easy, ultra-stretchy Hunza G silhouettes with a Burberry color palette, and will be sold on both brands’ websites, in Burberry boutiques and through select partners. To mark the launch, Burberry has created a new seahorse logo that reimagines its signature Knight as an underwater adventurer. He carries a “B” shield and a banner with Hunza G lettering. The swimwear logo also features as an appliquéd label on cotton garment bags. You May Also Like Last week, Burberry teased the seahorse to encourage customers to sign up for first access to the collection. The brand’s signature check appears on the swimsuits’ trim, bikinis and a multifunctional swim skirt and tube top. The pieces are dyed in a Burberry palette of black, white, “metallic cocoa” and red. Each comes with a matching scrunchie.…