The large is really cheap; but watch out for their expensive sodas!
Popcorn is a Common 
accessory cosmetic that was introduced in 0.1.0 and is obtainable by purchasing it from Samantha Snax at the Movie Snack Cart for 5,000 
.
It is 
Chroma Applicable, meaning players can apply chroma packs to it, allowing them to change its colour.
It rewards the player with a total of 20 
Style Trophies - 10 for owning it and an extra 10 if all 4 chroma packs are applied to it.