Ann Demeulemeester Tank

I know. Enough with the sheer. This is just a little something to layer with all the black I have purchased this season and it was a steal on Yoox.com. Labeled "Delicious Brown", it is more of a dark taupe. This delicate sheer ribbed cotton tank is extra long to peek out from under tees and jackets. When will it be warm enough to wear this?