Women's Black Puffer Jacket

Size medium Burberry Brit puffer jacket with sharp plaid lining and belt. I bought this second hand and am unsure of authenticity but it looks pretty legit to me with the buttons engraved. Size med and to note I am 5'9 and typically wear a size medium but I find this to fit small. I have the belt done up around the back. The filling is polyester and it's quite warm (for a cooler fall temp not necessarily a -30 Canadian winter temp! please note there is a zip for a hood but it didnt come with one. very cute jacket I can't wear sweaters with it because it's too tight for me!