The sweater I'm wearing has a strange slit in the back, but I sorta like it. I tuck on half in and that gives sone coverage. I do think it's a highly returned item. I linked sone alternatives if a back slit isn't for you. If you want a larger fit sizing up 1 or 2 sizes will give you an oversized longer look.
The sneakers run a little larger then other new balances. Sizing down a half size might be batter idea.