A Hairpin Feather is a Foxtrot movement. We were taught this way. After a Reverse Turn a Curving Three Step which finishes with the mans L.F. forward. Almost on the spot Back R.F. L.F. to the side R.F. forward ( foot position only ) Which is the same as any Feather Finish . The whole move is done on a Hairpin ( small). From there we were taught a Chasse into a kind of Drag Hesitation to finish diag to centre. You could if you wished simply do an Open Imputus after the Hairpin. Any one who knows how to do a Hover Cross would have no difficulty with the Hairpin