i'm wanting some bibs under $50. i'm 5'8" with a waist that hovers around 40" and 27" thighs. the problem is that i think the size for my height will be too long (i had to get the largest size knee warmers for example. they turned out to be leg warmers on me).
i would get the bigger size then take the straps down a bit (i.e fold them over and inch or two then sew them) I don't know if they make bibs for your dimensions, but if they did i doubt they would also be cheap. I would break out the sewing kit and modify some "tall people" bibs