So in the episode, I just realized that Weasley thrown a holographic snowball outside of the holodeck and it hit Picard, how? What magic is that? Or is it just because it’s so early in the series or just what? I must have a explanation (silly or cannon) for it happening…
In all fairness, they usually replicate the clothes prior to entering. Though, I imagine if one was so inclined, they could enter the holodeck buck naked and have clothes formed around them.