Tie in a black fiber tail at the bend, half a shank length.
Wrap a smooth, slightly tapered orange floss body to the 70% mark and rib it with 4 turns of black floss. The black-on-orange gives the Baltimore Oriole colors that name the fly.
Take 2-3 turns of black hen hackle and pull it down as a beard.
Set matched black quill wings low over the body.
Add a jungle cock eye on each side as cheeks, then whip finish a glossy black head.