Sauna suits are not meant to be worn in sauna. You are supposed to be naked in there.
Traditionally, you either wear a towel or you are naked.
Naked, usually on a small towel called 'pefletti'
Finnish sauna doesn't have steam - Turkish sauna has steam. In Finnish sauna you sit on the bench, throw water on the stove with the ladle and sweat a lot.
The cast of Rakennetaan sauna - 1973 includes: Nils Brandt as Korhonen Lilga Kovanko as Pipo Elina Salo as Kikka Gunvor Sandkvist as Neiti Pajala Johan Simberg as Salonen Birgitta Ulfsson as Kalle Gustav Wiklund as Pekka
I have been using sauna for 25 years almost weekly and I have no idea what a sauna suit is. Finns usually go naked in to the sauna. But the answer to your questions is "never" or "after a very long time". It requires you to be very obese to be even be able to lose 1.5 kg with sauna.The thing with sauna is that it causes you only to sweat, it is a way to cleanse yourself. There is no other magical weight burning effects. When a human body sweats too much, you get dehydrated and sudden dehydration is not healthy.
Sauna twin is a product that makes you sweat, but disgraces the name of sauna because it has nothing to do with actual sauna.
In a Finnish sauna, yes. In a Turkish sauna, no.
In a Swedish sauna yes, in a Finnish sauna no.
Sauna World Championships are held in Finland, not Sweden. Swedish sauna is about 60 degrees colder than the Finnish sauna.
Sauna
You don't use sauna suit in the sauna.