Sports Illustrated Swimsuit model and “Love Thy Nader” star Brooks Nader took one of summer’s most casual-looking heels — the thong sandal — into sultry evening territory last Thursday at the Quay x Nader Collection Launch Party at the Beverly Hills Hotel in Durban, South Africa.

Her black thong sandals combined the toe post and nearly bare upper of a flip-flop with a slim kitten heel. The hybrid has repeatedly appeared with jeans, capris and other relaxed pieces, making it a daytime shortcut for celebrities including Hailey Bieber and Katie Holmes.

The rest of the guest list picked up the same after-hours resort mood. Lori Harvey, Grace Ann Nader, Stassi Schroeder and Chantel Jeffries kept their outfits neutral through black, brown, cream and white, and nearly every look ended in a thonged silhouette, an open toe or low heel, creating a loose footwear uniform without making the party feel overly coordinated.

The evening celebrated “Made to Be Seen,” Quay’s new eyewear collaboration with Brooks and her sisters Mary Holland, Grace Ann and Sarah Jane Nader. Priced from $75 to $175, the collection includes oversize, shield and narrow sunglasses alongside optical frames. Each sister influenced a different section of the assortment, which Quay developed to reflect their individual styles while still reading as one family offering. Ahead, take a look at the guests’ barely-there, strappy shoe styles from the evening.

Brooks Nader

Nader’s thong mules left nearly the entire foot exposed, with fine V-shaped straps meeting at the toe post before rising onto a thin stiletto heel. She kept that easy shape intact, but changed the mood around it with a fitted chocolate-brown halter dress cut with a plunging neckline, ruching through the center and an asymmetric midi hem. She added Quay’s oversize No Comment sunglasses.

The model and entrepreneur paired black thong sandals with cropped leggings and a plunging black-and-white printed halter top. The barely-there shoes, which seemed to be heeled, elevated the capris without pushing the outfit into traditional cocktail dressing. Her In the City sunglasses kept the look in the same tightly controlled palette.

Grace Ann Nader

The “Love Thy Nader” star selected black sandals with a slim front band and narrow straps crossing the instep and ankle. She paired them with a chocolate-brown halter midi gathered down the center, offering a more structured variation on her sister’s flip-flop heel.

Stassi Schroeder

The “Vanderpump Rules” star, who also just walked the Sports Illustrated Swimsuit runway, supplied the clearest color break in red open-toe mules beneath a fluid ivory midi dress. The saturated shoes cut through the pale fabric and prevented the look from drifting too close to bridal, while her $125 No Comment sunglasses returned it to the party’s glossy summer mood.

Chantel Jeffries

The DJ, producer and model went monochromatic in white square-toe mules, which appear to be Bottega Veneta’s stretch leather wedge mules, paired with a strapless crop top and tailored shorts. A broad upper gave the curved low heels more presence than the evening’s thong sandals but stayed in the mule territory. She finished with Quay’s narrow $95 Hot Single frames before taking over the live DJ set.