If you are able to use a sewing machine, why not make some kilts which are going to be easy to make smaller.

If you create the kilt in two sections, each with an apron and some pleats then you can take it apart, remove enough pleats to restore the correct proportions and then rejoin the two parts.

If you make the large pleats a tad smaller than normal then you can move material from the aprons into the large pleats to make them a smidge smaller (a tad being half a smidge).