Kim Kardashian still has her sister Khloé’s 38th birthday vacation on her mind, per her latest Instagram post. The image gallery showed the sister duo posing on a sandy beach as they sported matching metallic bathing suits by Skims. Kim wore a silver bikini with a triangular top and mid-waist bottoms while Khloé opted for a matching one-piece with a plunging scoop neckline. With their blond hair and sleek sunglasses, the duo looked as though they were extras in a futuristic film. The snapshots showed the sisters splashing around in the water, as well as Kim taking a refreshing outdoor shower.

“House of Kards,” Kim captioned the post, reminiscing about their luxurious vacation in Turks and Caicos earlier this month. Khloe quickly responded with a tease, writing, “I love a good post without approval lol” followed by a compliment, “Keeks you are BOMB!!!” Their bathing suits were unveiled in a recent Skims campaign that echoed early ’80s glam (think big hair and bold makeup) and evoked the popular “Dynasty” soap opera.

While the rest of the family was also on the trip, so far, Kim and Khloé are the ones who have documented their adventures the most. Just two weeks ago, they twinned in matching black bikinis in a photo that Khloé shared. “We are still looking for that damn diamond,” she wrote under the post, in reference to a memorable, now-iconic “Keeping Up With the Kardashians” episode, where Kim had a meltdown after losing a diamond earring during a beach vacation.

Khloé’s birthday is turning out to be a month-long celebration, and based on the images they’ve shared, the Kardashian sisters certainly packed the appropriate apparel. Keep scrolling to shop Kim’s exact bikini and other Skims swim separates.