Hi! A hoodie is usually associated more with casual attire and comfortable clothing. (i.e. hoodie- http://fashion-wholesaler.co.uk/shop/1761-6913-thickbox/mens-fashion-plain-zip-up-hoodie.jpg ) Jackets can be many different styles...think of blazer or coat or light coat. (i.e. https://www.google.com/search?q=jacket&client;=safari&rls;=en&source;=lnms&tbm;=isch&sa;=X&ved;=0ahUKEwih3LqepKjJAhWMOCYKHcSRBqQQ_AUIBygB&biw;=1280&bih;=738 )

They're different things. A hoodie is a casual sports-style garment, usually made out of soft cotton - like a kind of thicker/fleecier t-shirt material. You can wear a hoodie indoors. It's more like a sort of sweatshirt garment that happens to have a hood. A jacket is more of an outdoor garment - basically a coat that only covers the top half of your body. You get formal, tailored jackets that can be part of a business suit. You also have all sorts of jackets to protect you from the weather - padded jackets, ski jackets, puffer jackets and so on. These may or may not have hoods. I wouldn't class a hoodie as a type of jacket.

A hoodie is a hood. A jacket doesn't have a hood. Also, a hoodie can be a long-sleeved shirt with a hood. I think in your situation, just teach them "hoodie".