Disclaimer: I don’t do that.
But as other have said, layers trap warm air better than 1 thick layer. This is the theory behind double glazed windows. Also why multiple thin blankets warm more than one thick one.
So long Johns, vest/light t, long sleeves T-shirt, sweater, and coat. Strip down or keep on as desired.
Plan the activity with a smaller group than you would want initially. Then invite others to an already organized event and rely on fomo to get people to go. Works great.