After trying a few others that didn't work out for one reason or the other, I have found these to be the best for me. The fact that they're sewn here in CA is a plus too. Note: they make many different bibs, the black label is their best. Fit is true to size (at 6ft 220 lbs the L fits me well). The largest size these come in is 2XL.
http://voler.com/browse/product/li/1110554