Please believe me nab when I say you will be far off better just ordering a set of straps & buckles from Highland Xpress.

Kilt straps are not just a random chunk of leather cut to shape. If you do not cut exactly along the grain they will stretch. If not properly tanned and dyed the straps will wear out in no time at all. The edges will fray, the dye will wear off.

You will be money ahead and frustration avoided by simply ordering the same high quality straps and buckles many kiltmakers do.