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Breastfeeding: nursing clothes?

Did anyone not go out and buy a nursing wardrobe especially for breastfeeding? I am not working right now and am planning on breastfeeding when the baby comes (I am due next week); and I really don’t want to spend more money on nursing clothes, especially since most of my feeding will take place at home.
Did you manage to wear regular clothes or maybe more cardigans/tank tops when breastfeeding?
Also, is a breast pump a necessity or is it something that only some women need when breastfeeding?