"So I gotta be real with you guys. You look like f--king clowns," Kim tells her sisters in a preview for Sunday's "Keeping Up with the Kardashians" episode. "I'm not f--king kidding. This is not like a tourist thing where it's Halloween,[don't] dress up like a f--king Japanese geisha. Unless we're at a geisha house."
"I thought my hair looked good last night and I thought my outfit was fun for Japan," Kourtney replies.
"Your outfit would've been great if you didn't have f--king blue eye shadow," Kim shots back.
The eldest Kardashian wasn't going to let her sister win this argument and pokes fun at Kim's love of bicycling shorts.
"You think I look liked like a clown? Well, you look you just won the Tour de France and you're cycling around town," Kourtney claps back in a confessional.
The KKW Beauty founder then advises her sisters that they need to tell their makeup artists to tone it down.
"So I'm just saying, you have to like, tell the glam people," Kim instructs her sisters. "Especially we're in Japan. Everyone just thinks, 'Oh my God we're in Japan, everyone go full Japan.' And probably the people that live here make fun of people like that."
Kourtney replies that she didn't think her colorful outfits were "that crazy," but Kim insists that her sister needs to just be "cooler." The mom of three tells Kourtney and Khloe that they need a "fashion overhaul" in order to stay "young and relevant."
"I'm not telling you guys who to be or what to wear or anything," Kim adds. "But I'm telling you who to be and what to wear."
"Keeping Up with the Kardashians" airs Sunday nights at 9 p.m. ET on E!