This Version could be relatively cheap Image 2
You could use the leggings. Purchase yellow or white boots or make boot covers. Even tan can work in a pinch. boots on shopgoodwill.com
Buying a long sleeve black top IF you do not already own one.
Buying yellow fabric or dying white fabric yellow. (A bed sheet would work great). For the emblem, cut out a Bat shape on cardboard, trace onto fabric, cut out 2 peices, do a zigzag stitch around edges, flip inside out, do a straight stitch to finish it off, and use FABRIC Glue
to attach to shirt.
For gloves: those yellow rubber dish gloves can work in a pinch, but for accuracy, you can always make a pair or look around for a suitable pair of gloves.
For the cape: a black sheet could work and then just stitch a yellow sheet to the other side, flip inside out, done!
Hope that helps.
This costume would not be super expensive if you do your shopping well.