Could you put it on, mark the positions of the add-ons, then take it off and sew them? Or temporarily glue them on while wearing it, then sew them?
Past Cosplay: Death of the Endless, Trinity, Austria, Orihara Izaya, Mey-Rin
Current Cosplay: Dodo Chaplet (Doctor Who)
Future Cosplay: TBA
For cosplay photos please visit Queens' Right deviantArt page