Yes you can keep the pants! They vary (more expensive I think at B&C).
Magic Kingdom's version is three scoops, one each of strawberry, chocolate, and vanilla. There toppings including hot fudge, strawberry, and caramel. Then it is topped with two types of chocolate chips, whipped cream and cherries.
Beaches and Cream has the same as above with another sauce topping peanut butter I think, with brownie, oreo, chocolate shavings and sprinkles.