All the info concerning gauge and measurements are inside the pdf.
I used in totall circa 495 meters of yarn (see my first project-info).

The first photo reflects a more right colour of this Petra-yarn.

Please notice that this overall requires an intermediate crochet skill level.
This is not such a quick crochetwork anyway, but the fit is for longer times to come up. They are practical: really something like fitting at the age of two or two-and-halve until 4 or four-and-a-halve or even more.
Just change the position of the buttons inside the buttonholes.

Also here variations are possible: the legs can made longer or, instead of an overall, one can decide to end this pattern up like a skirt, crocheting top down.

I am sure improvements of this pattern can be made, but being a free download, this is up to the users of the pattern, if wanted.