Where can I find a larger box pleated school skirt?

[GoldenGate]

We are trying to get a new skirt for DD for next term who has outgrown the largest size available in the skirt she has been using and many girls in her school too. The M&S stitch down box pleat in navy Girls' Permanent Pleats School Skirt (2-16 Yrs) | M&S which does to about 34 inch waist, she will need 36 or 38 now (medication she is on has a lot to do with that) and want one as close as possible. Seems odd being so particular about uniform but she is like that with all clothes. Familiarity.

We got a larger size which she didn't like as it had many and shallow pleats not just a few front and back. This style looks increasingly hard to find and the school allows any pleated navy skirt, but worth looking for a close match.

This one specifically says that it 'is 'generously sized' - but may be the one you have already found?

Premium Senior Permanent Pleated Stain Resistant School Skirt Navy (10-16+ Years) share.google/uH2SGHxyYhgoPgblh

Thanks for link it does look lovely though notably different style. Just wondered if the same stitched box pleat style was actually available anywhere in bigger sizes.