Answer:
In spring I look gay, Covered in a green array, The warmer it gets the more clothing I wear, As the cold grows, I throw away my clothes.
What can you keep after giving it to someone?
What is not a ball but yet a sphere, and holds all lands and people year after year?
What has a foot but no leg?
Watches students at the prom to make sure there's no funny business.
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.