Since we sell our suits in sets of one size for the jacket and skirt, it is not possible to mix and match. We would like to advise you to choose the right jacket size, and to have the skirt adjusted by a local tailor.
The design allows for a tailor to adjust the waistband of the skirt up to 1.5 inches either way (bigger or smaller). This is fairly easily possible by adjusting the side seams and darts at the top of the skirt. The costs of these adjustments are usually quite low.
If worse comes to worst and you or your tailor think it cannot be done, you always have the option to send the unharmed suit back for a refund.