In American English, a
jumper is a type of sleeveless dress that is worn over a blouse or sweater.
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tank top is a sleeveless shirt with a low-cut neck.
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sweatshirt is a fleece-lined shirt. It can have long or short sleeves, be a pullover style or zip up the front. It can also have a hood (called a "hoody" in BrE).
Platform shoes were all the rage in the 1970s, and came back into fashion in the late 1990s. (Can we blame the Spice Girls for that?)
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blouse can describe almost any type of women's shirt.
Capri pants end just below the kneee. They are a dubious fashion trend and are more appropriate for digging clams on the beach than for every day wear.
Boot-cut jeans are loose through the leg and wider at the ankle, so that you can comfortably wear boots underneath them.