XL rue 21 black knit dress or cover up

this is size extra large. It has pockets on both sides with big black buttons. Is a cable knit dress or cover up. From rue21. this dress has no lining. The white you see in the pictures are the mannequin underneath. Length in back is 34 in. while lying flat back at armpit is approximately 18 in. Feel free to make an offer. idb24