1780-1800. V, T.30 "This pair of mittens [should be "mitts"] in bright yellow taffeta is typical in shape and construction. They have a separate thumb and an elegant point at the back of the hand. Following the style of leather gloves, there are three ‘points’ or narrow lines raised with stitching in white silk thread. All the seams have been embroidered over in herring-bone stitch in white silk."
How to Lace a Corset » By Sidney Eileen. This article mentions how you should make sure that the lacing is wide enough to go over your head if the corset does not have a front opening (which will probably be the case for the cosplay). I might need to hide the laces around the wings or tuck them through the skirt... Both the standard lacing and offset lacing are discussed.