El tejido es con dos agujas, pero las imágenes dan una buena idea para hacer un bolero con un rectángulo. Yeah, that's what I was gonna say. actually this can be done knitting, crochet, material as it is just a rectangle sewn to make sleeves!
From a Spanish site which can be translated but it is for crochet ~ hopefully will be able to work the schematics out for knitting ~ love the neckline and high buttoning. Make your own buttons ~ Instructions on my board, maker ~ button.