Nightgown fashion: Why people are wearing nightwear anywhere but bed

This is not your grandmother’s nightgown. Or maybe it is. The same style of sleepwear that was once strictly relegated to bedrooms and boudoirs has now become the summer dress of the year.

Reformation’s Holly Sleep Dress ($128), a floaty mini dress with a scrunched 1950s-style neckline with scalloped edges, was inspired by “vintage nightgowns…