Do actors wear their own brand underwear?

[Jdcruz]

Just curious for anyone with the inside track, do actors wear their own brand, color, and style underwear under their wardrobe or do they have to wear specifics ones for certain scenes that may involve an intentional or inadvertent sighting?

 

[Tony56]

I do not have an inside track but my guess is that they wear whatever wardrobe puts them in.

I have heard Tom ??? AKA Spiderman report that he had to wear a thong under his costume because it was so tight and revealing. Not his idea, but wardrobe's.