Postpregnancy undershirt one of the comfortable clothes you need during your pregnancy is pregnant athletes. They allow you to have a comfortable pregnancy. Pregnancy period is a period when the body gains weight and changes shape rapidly. Your old underwear and undershirts will not fit your growing stomach, as they have a thin waist. Also, you cannot fit your old clothes due to the weight gain. In addition, you need postpregnancy undershirt that can grip you flexibly without squeezing your tummy and will make you comfortable.