If this is the victor: Download the first costume (.SVG) and go to https://cloudconvert.com/svg-to-png , then upload the file and use the modify option (looks like a wrench). Next, set the pixel height and width (the max on Scratch is 500pi under so-and-so file size, but for personal use, I recommend somewhere between 1080pi and standard 4K 1:1 :-) ). Finally, convert and download.
His previous designs and my take on em. —————————————————— Please check out my YouTube Channels: Halo: youtube.com/@spartanforjesus Stop-motions: youtube.com/@e516motions