C'est Moi Bamboo Seamless Tank
A great layering piece, or wear on it's own. Tucks in easily to jeans and skirts. Bamboo seamless knit is breathable and stretchy, suitable for any season. Wide straps offer great coverage for bra straps. Not specifically maternity, though there is more than enough stretch for a belly. Not designed for nursing, though the fabric is stretchy enough you may be able to pull down for access.
One size fits women's 2-12.
51% Bamboo, 21% Cotton, 20% Nylon, 8% Spandex. Machine wash cold in a laundry bag. No fabric softener. Lay flat to dry.