Drainpipe jeans are a type of pants that are very narrow and slim fitting. They look like someone poured glue down your legs and sealed them shut! They get their name from looking like a drainpipe because they are so straight and tight.
Think of them like this - Have you ever seen a straw which is very thin and doesn't have much space to let liquid flow through? Similarly, drainpipe jeans are like straws for your legs. They are thin and tight from waist to ankle, which makes your legs look really skinny and long!
People like to wear drainpipe jeans because they are really popular and fashionable. They look cool and can make you look really trendy. Some people even like to wear them with high heels because they like how it can show off their shoes.
Remember, drainpipe jeans are just a kind of pants - they are skinny and have little wiggle room, but they can make you look really stylish if you wear them the right way.