Board Thread:DC's Legends of Tomorrow discussions/@comment-9346948-20180410010248/@comment-27700324-20180706050413

Actually the suit was made by Lucius Fox's team at Wayne Enterprises. His first suit however was just some hoodie and a couple of ski masks.

BTW Kate was around the same age as Bruce. I am just saying they could connect it to an already established TV Gotham world that has some lore already. It makes things easier for them.