stickpin

If the suit is buttoned, where should be the stickpin?

西装系着扣时，领带夹应在衬衫的哪两粒钮扣之间？

If the suit is unbuttoned, where should be the stickpin?

西装敞着穿时，领带夹应在衬衫的哪两粒钮扣之间？