Topshop bodycon twist-back midi dress

Topshop blue-grey dress with twisted back detail. Purchased in Ireland in 2016 or 2017 and worn only once. Fabric is polyester/cotton blend, and falls at midi length on me (I’m 5’9”). There are slits on both sides. Cap sleeves and scoop neck. Selling because I simply can’t fit into it anymore! The back is such that you either need the right bra (which I also don’t have) or the courage to go bra-less! The fabric is quite light and clingy.