Having read this part in the novel, in this instance corsets and paniers weren't exactly villainized per se. The issue was that the dresses are heavy, it's the middle of summer, and it's a day party with obligatory dancing. So the "painful" part was how great the risk of heatstroke was.
Though the novel translations ended not far past the party, so dunno if there was an anti-corset rant later on. ╮( ̄▽ ̄)╭
idk much abt corsets but i think it's because throughout history like in the movies etc they portray a woman wearing a corset to be like a hassle cuz they always show the servants tightening it suuuuper tight and it looks hard like cardboard... it also doesn't help that corsets centre around the idea of shaping a woman's body to have smaller waist which, when you look at it, looks quite uncomfortable and frankly painful to put on so maybe that has smtg to do with these isekai novels disliking corsets haha
I'm glad to see people standing up for corsets ╥﹏╥ If anyone is interested in learing about corsets and has 15 minutes to spare, I'd recommend watching "How Victorian Men Taught Us to Hate Corsets: The Biggest Lie in Fashion History" by Karolina Zebrowska, or "I Grew Up in a Corset. Time to Bust Some Myths." by Bernadette Banner on YouTube!
Most movies represent corsets wrong tho? Corsets are like historic bras. The only times they were tight laced was for rare occasions, and most movies fail to mention that to get that slim waist and everything, they kind of created an optical illusion. They would pad the boobs and butt to make them look bigger and the waist smaller. So while it looks really exaggerated and painful, it wasn’t because that wasn’t there actual shape, it was padding. And in terms of organs moving, it was never permanent. Your organs move around more when you are pregnant, and they always move back, and the same was with corsets. Yes it could be dangerous to tightlace every day, but nobody did that. Most things considered common knowledge today about corsets are generally wrong especially in terms of historical corsets. I’m not a professional on this subject, but I have done some research on this subject.

Not another comic villainizing corsets smh... also, if the robe a la française was an eighteenth century thing, then it wouldn’t have technically even been a corset, rather it would have been stays, right? And even then, it wouldn’t have been painful necessarily... heavy, yes, painfully constricting no. If it was then that’s a problem with the design since corsets and stays were historically made to fit you especially for nobles. It was all custom to not be painful... I don’t know, fashion history buffs support me please