The collab: I Heart Ronson for JC Penney
When: 2009
Why: This collaboration was the first in JCPenney’s roster to really up the department store’s fashion cred–and it was also a major coup for Ronson, who was a relatively low-profile designer at the time the collection was launched in the spring of 2009. Plus, it’s still going strong, making it one of the longest-running designer collaborations yet.