chouyatouWomen's Fashion Studded Perfectly Shaping Faux Leather Biker Jacket

I'm a ddd bra size. should i get the 1xl or 2xl?

I wear size 16/18. What size should I purchase?

Is the zipper bottom removable?

Have the size issues been fixed? I bought this a few years ago and at 5'4" 150lb my arms simply have too much muscle to fit in the medium.