F1nn has got multiple types of fake boobs. The chest-plate is not interchangeable, but present as some of the best looking fake tits he's got.
Then he's got various sized sets of boobs that stick on, individually, to his chest. They're best to generate a girly figure, without an outfit showing cleavage.
Finally he's got this weird chest-plate, pinch, thingy......not sure what to call it. But it actually presses his own pecks/breasts together. (yes, men have breasts, just not exactly big) That weird device combined with contouring makeup actually make for some convincing cleavage, if someone small breasts.
Sitting here as I type all this up, I think I might have watched a few too many of his streams.