You 🫵 person in Europe who’s finding it unseasonably hot and you suddenly don’t know what to wear on, like, a hot train.
You’re going to go on Vinted or eBay and put in “made in Italy”, “moda Italia” or (translation of same.) add the search term “silk top.”
What you want are tops that consist of these really thin jersey vest tops with a floaty pure silk layer over them. You’re looking to spend £8-20. You might need to specify “floaty” or “lagenlook.”
There will usually be a healthy secondhand collection of these online. Try to get a pure silk overlayer if you can - some of them are silk blended with viscose.
You’ll probably find the designs kinda mid or old-lady-ish. Don’t worry too much about this. They’ll actually look pretty cool on, and everyone will be jealous of your freedom from suffering.
These tops will keep you much cooler than skimpier ones.