To be honest, I would not recommend making a cosplay last minute for a convention and this is one of those cosplays that you REALLY can't do last minute since Discord has a tendency to loom over any Discord related projects. The horns alone took me at least a week to make and that was after many months experimenting and failing miserably. The tutorial on how I did the horns exactly is still in production and I will hopefully release the tutorial for that in the next two months. Below are the tutorials I followed for the horns, but I still had to make special arrangements for Discord.As for the wings, I followed this tutorial. As a tip, the girl tells you to outline the wings with Sharpie, but I learned the hard way that it doesn't work too well. Felt, which is the fabric you use, likes to rub off the Sharpie ink on other cloths and things easily so I would try fabric glue or something else. As another option, you could try crafting foam (instead of sewing use hot glue to put everything together) version which you can get at Joann Fabrics and Micheal's.As for the wig, I got it at CosplayDNA (the link to the specific wig is below) and then I dyed the tips using black sharpies. If you decide to dye the wig, be sure to wrap your horns when you store them with the wig so the sharpie doesn't rub off on them.As for the gloves, I made a tutorial for that.As for the shoes, I already had those flats but I also switch them out for my brown flip flops with gold straps depending on my mood and feet. The flats I got at Macy's (they are from the RocketDog brand) about seven to eight years ago and the flip flops (from the Havaianas brand) were given to me for my birthday about two or three years ago. So, I'm not sure if you will be able to find those exact shoes.As for the vest and pants, I made them. Now since you're doing this cosplay last minute, I don't recommend making it from scratch. I would suggest buying the vest and pants and alter them as you please since you have to make all of the other stuff already. But if you insist on making it from scratch, the fabric I used was brown, green, and yellow cotton/polyester fabric from Joanns since cotton and polyester are the only fabrics my sewing machine takes. As for the patterns I used, I used the Simplicity brand and unfortunately I can't find the links to those specific patterns. But I got one for a vest and one for a pants that basically a sweat pants. As for the stripes, that was improvised with scrap fabric so there is no pattern for them.As for the cosplay being cheap, cosplay is an expensive hobby in general so making it cheap is not that easy. I tried to make it as cheap as possible, but I ended up spending around $150. But good luck with your cosplay!