Definition of "mathematically"

It was a figure quite out of key with that lonely landscape, for it wore a panama hat and a neat dark suit, cut to the order of present day dandyism, which required coats to be tight-waisted up to the armpits and trousers belted in that they might bulge out into extra wide mathematically squared bags.

1938, Norman Lindsay, Age of Consent, 1st Australian edition, Sydney, N.S.W.: Ure Smith, published 1962, page 63