Marc Jacobs, another dot-mad designer, referenced both Minnie Mouse and the itsy-bitsy-teenie-weenie-yellow-polka-dot bikini in his fall collection. Fellow designers and brands in the polka camp?

It may not have polka dots. But that hasn’t stopped the Internet from arguing over this itsy-bitsy, teenie-weenie, yellow bikini – for babies. The controversy began when Brooke Cornell ...