I think this is the type of underwear they are required to wear.

Possibly drivers were wearing other underwear underneath this? Isn't that the thing that is forbidden now?

We have seen some drivers in these white underwear, maybe the bulges will be better visible in these suits from now on.
 

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In summary, it sounds like no non-FIA underwear permitted, regardless of whether it was under the FIA underwear or in place of it. Either way, that's fewer layers. And since it looks like Lando has been violating this rule, that benefits us greatly.
 
If you take off his glasses, editing on all the photos and the cap is the ugliest and most asymmetrical driver on the grid, open your eyes, you don't have to attack people for giving their opinion either, tho he/she could be more respectful. Gasly is overrated, be sexy is not only good photos on Instagram.
Be careful of f1bulges. He is threatening people here in this forum. He is protected by the boss. Be careful of him. Don’t dm him. He reports people indiscriminately. He is trading pics and vids 18-. The forums knows but doesn’t do anything.