This Dress Trend Plus Closed-Toe Flats In This Color Is *the* Outfit of Summer 2026

Shop the coolest combination of the season.

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Elsa Hosk wearing a white sleep dress and flip-flops with a tan baseball cap
(Image credit: GuessWhoISaw/Backgrid)
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There are few things chicer than an Elsa Hosk outfit. Any fashion editor can confirm. She often combines multiple of-the-moment trends into one outfit, and does so in the most effortless of ways. The latest summer trends she combined made for an easy outfit I highly recommend copying.

For starters, the summer 2026 dress trend Hosk wore was a sleep dress. In case you're wondering why, exactly, people are wearing sleep dresses outside, let me explain. It's basically a term given to loose-fitting, unstructured summer dresses with pretty, vintage-inspired details such as ruffled trim, bows, and eyelet. If you were to actually sleep in a dress, this style would be a good one to do so in. They're often white (as Hosk's was), but certainly don't need to be. With her puff-sleeve sleep dress, Hosk wore the other closed-toe shoe trend (sorry, sandals) I want to make sure is on your radar: bright blue flats. It may seem a bit specific, but ocean-adjacent shades such as aquamarine and cerulean are a major color theme this summer, and flat shoes are one of the forms in which people are embracing it.

Scroll on to see Hosk's sleep dress-and-blue-flats outfit for yourself (along with another recent occasion in which she wore the sleep dress trend), and shop similar styles for yourself.

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On Elsa Hosk

Elsa Hosk wearing a white sleep dress with a raffia bag and blue ballet flats

(Image credit: @hoskelsa)

On Elsa Hosk: Sandy Liang Daikon Dress ($350); Saint Laurent Panier Medium Bag in Raffia Tote Bag ($2000); Chanel shoes

Another Elsa Hosk Sleep Dress Outfit

Elsa Hosk wearing a white sleep dress and flip-flops with a tan baseball cap

(Image credit: GuessWhoISaw/Backgrid)

On Elsa Hosk: Helsa Midi Dress With Lace in Tech Poplin ($141); Polo Ralph Lauren Logo Cotton Twill Ball Cap ($40)

Shop Sleep Dresses

Shop Bright Blue Flats

Allyson Payer
Allyson Payer
Senior Editor

Allyson is a senior editor for Who What Wear. She joined the company in 2014 as co-founder Katherine Power's executive assistant and over the years has written hundreds of stories for Who What Wear. Prior to her career in fashion, Allyson worked in the entertainment industry at companies such as Sony Pictures Television. Allyson is now based in Raleigh, North Carolina, and is originally from Baton Rouge, Louisiana. She holds a BFA in theater arts. Her path to fashion may not have been linear, but based on the number of fashion magazines she collected as a child and young adult, it was meant to be.