Which innovative retail strategy significantly increased visitor spending at the Imperial War Museum's gift shop after its 2014 redesign?

Military museums face unique challenges in retail merchandising that balance respect for history with commercial viability. Their product strategies must consider educational value, historical accuracy, and visitor engagement while generating revenue. How well do you understand the specialized world of military museum retail and its distinct customer experience considerations? Test your knowledge of this niche intersection of military history and retail strategy!

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Creating themed merchandise 'collections' aligned with specific exhibits and campaigns (e.g., D-Day, Battle of Britain)
Implementing interactive digital kiosks where visitors could custom-design their own military insignia for printing on merchandise
Introducing a subscription box service for military history enthusiasts featuring replica artifacts and exclusive content
Partnering with luxury fashion brands to create premium-priced 'military-inspired' clothing lines