Memorial Day is behind us. It-girl clothing brands recently acquired by private equity firms are making a killing on ’90s-inspired viscose satin slip dresses with a complex relationship to undergarments. A certain kind of conscientious woman, between the ages of 25 and 38, with a remunerative project manager job and a reasonable skincare regimen, is teetering on the verge of a nervous breakdown. Wedding season is upon us.