Jenny,
That is very pretty. Judging only by your photos, it appears you may have a piece of antique clothing, dating from perhaps the late Edwardian era to the mid 'Teens WWI era. The narrow rows with the tiny slits were referred to as "beading" and often a lady would lace colored ribbons through the slits. Of course it could be a later reproduction style, but I cannot tell just from the photos. It looks to be a corset cover or camisole, although camis did not have sleeves.