Sweaters or hoodies are used for two different purposes. Sweaters are used to protect you from cold environments, to give you warmth by insulating warm air inside your body. Hoodies are especially used to protect you from cold conditions but is mostly used to cover your body and the head region too, which is not available in a sweater.
According to me for a tough cold condition a sweater with a warm head band is best for fashion and style, while hoodies are best for fitness workout or gym exercises for a bit cold condition.
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