One of my favorite instances of this recently came from one of my least favorite dramas, The Bad Mother. There are two thugs who need to go undercover in the countryside town where the ML is living since losing his memory, and they are quite bad at it. So they end up buying land and the next time we see them, they are legitimately farming it in complete flowery outfits. They were such a weird bright point in a dark and terrible drama!

Just one is ringing in my head - Song Seung-hoon in Dinner Mate episode 1&2.

She was pretty had a scene like that. Lead couple didn't have money to pay for their meal and had to help a countryside elder.

Since Hometown Cha Cha Cha was one of countryside Kdramas, I didn't remember the episodes where Shin Min-ah wore some floral dresses and of course, there was a fourth episode where Doo-shik (Kim Seon-ho) wore floral shirt during jail visit.

Hometown Cha Cha Cha> When the leads are doing the laundry and when the ML asked for a shirt to a cop and got a flower shirt.

Cheer up (2022) episode 10 the cheerleading team goes to help their leader whose mum runs a place in a seaside town and they work at the market on various stalls and perform on stage in their Ajumma outfits.

This one had me smiling. Thanks @dramaddictally!

Because This Life Is Our First, episode 11. Nam Se-hee goes to the countryside to participate in Yoon Ji-ho's family kimjang...arriving, of course, inappropriately attired for actually helping to make the kimchi (but nicely attired for the male tradition in that family of sitting around while others do the work).

So, since he's definitely there to work (plot point), he is offered clothes to wear from Ji-ho's family household, including some fantastic flowered pants.

It's also worth mentioning, I feel, that the chartreuse jacket over the fuschia zippered sweatshirt he wears to match these flowery trousers prove to be absolutely fetching colors on Lee Min-ki!!

Just any episode of Top Star Yoo Baek, I guess.

Probably with the same for dramas with Shin Min Ah being mistreated by random people in the countryside: Our Blues and H Cha Cha Cha.

The drama with Eric and Chewbacca (Waikiki) and a kid?? Where he's a Chef... Chef Moon? That one.

This one was not a case of wearing someone else's pants but I think the effect was the same: Kim Do Gi in Taxi driver 2 played a country bumpkin in one of his mission, where he wore flower-print pants by choice :)) And one beanie (I'm sorry I can't recall who right now) called him tractor driver 😂

Here he is
https://i.imgur.com/BjmhZqh.jpg (source: soompi).

Life on Mars Episode 2 when the Captain falls into a vat of some sort of liquid and has to change his pants to the flowery kind while a crowd of cops and reporters looks on!

I'm pretty sure I saw this in Fantasy Couple, and maybe in The Vineyard Man.

So Ji-sub in My secret, Terrius, episodes 23-24.

Although I forgot almost everything about this atrocious drama, you cannot unsee So Ji-sub in flowery ahjumma-clothes.

I feel like there is a catch to this promot. There are just too many shows!

In Taxi driver 2, they're two episodes of Country Bumpkin Lee Je Hoon.
In Zombie detective, our zombie borrows a few clothes.
In Café Minamdang, Seo In Guk manages to look good in full flowery pink ensemble.
In Crash landing on you, I'm not sure Se Ri really appreciate the flowers, but she takes what she is offered.

My memory is not sure, and I do not have it in my table... is it in Secret Terrius or in Man to Man that the secret agent borrows a few flowery clothes while on the run?

In Oh My Baby episode 5, the OTP were stranded overnight in the country when the drama gave them a conveniently timed landslide. Go Joon in his flowery elegance (top and bottom!) being all manly with chopped woods is a sight to see, especially when it turned out fire isn't even necessary since the inn has gas stove!

In COFFEE PRINCE, Eun Chan and Han Gyul both wear ahjumma pants when they are talking in the middle of the night on their apple picking trip.

In CRASH COURSE IN ROMANCE, Choi Chi Yeol wakes up on the couch wearing ahjumma pants after a night of drinking with Haeng Sun when she is upset after getting her brother out of jail.