Just ask Chloë Sevigny, purveyor of street style, who’s been wearing Natacha Ramsay-Levi x Ecco footwear all around New York City.

So long, in fact, that Ramsay-Levi knew that the shoes—part of her second capsule drop for the Danish shoe brand Ecco—would walk straight into Cool Kid Land, and she was right. That elusive ...