Aside from all those other maternity clothes (read: maternity jeans, the best maternity leggings, maternity nightwear/pyjamas and a baby changing bag), moisture-wicking pregnancy underwear is a must. During your first trimester, maternity underwear might not seem like such an important purchase – but you’d be surprised at how quickly you’ll change your mind. Maternity pants are a stretchy and sure-fire way to guarantee comfort for you, make incontinence more comfortable, and support your bump.