Very little about this designer, one-half of the clothing brand Eckhaus Latta, is conventional. With Zoe Latta, Mike Eckhaus casts models of all ages, genders, and sizes in the brand’s runway shows and campaigns, and makes clothes out of unexpected fabrics such as fishing lines and plastics. His frequent collaborators come from outside the fashion world, from friends like the musician Dev Hynes to the sculptors and furniture designers whose work is featured in his stores.