Use minecraft.tools and click on banner crafting, customize your banner and instead of copying the whole command, only copy the curly brackets and paste it in the 2 chain command block from the repeating command block and replace the text with the curly brackets with your curly brackets. Please note that needcoolshoes.com nolonger works. download this structure file then go to your folders, search %appdata% then click on .minecraft then saves click on your world, and if you dont see a folder that says structures, create one. Then in that folder put it in the NBT file and go into your world do /give @p structure_block 1 0, and place it open it up and click on the D until an L pops up and put in at the top CPARS and click detect once than load. Blue concrete is to summon the custom cape, red is to remove it. REMEMBER CHANGE THE TEXT THAT SAYS NJGMC IN THE CHAIN COMMAND BLOCKS AND IN THE OTHER ONE CREATE YOUR BANNER THEN PUT THE CURLY FRIES IN AND have fun!!! CLICK THE TINY DOWNLOAD BUTTON AND OPEN UP THE TEXT FILE CLICK SAVE AS THEN INSTEAD OF TEXT DOCUMENT SAVE IT AS ALL FILES AND TO YOUR DESKTOP HAVE OPEN THE STRUCTURES FOLDER AND DRAG IT IN THEN DO THE OTHER STUFF.
LINK HERE: https://pastebin.com/23NjNcTa