Old Navy Maternity UltraLite Rib-Knit Side-Shirred Tank Top This Old Navy Maternity UltraLite Rib-Knit Side-Shirred Tank Top ($18-$20, originally $20) is a good option to slip on for a workout. Image Source: oldnavy.gap.com Old Navy Maternity UltraLite Rib-Knit Side-Shirred Tank Top $18 from oldnavy.gap.com Buy Now