I think it is a purely individual choice, though for someone purchasing it is sometimes the choice of the maker rather than the eventual owner.
It is not a true buttonhole, in that there is no bar of thread through it to fix a button. The strain of fastening be taken by the fixing of the buckle and strap. Constructing a continuous line of reinforcement within the garment is important, and the slot could be a weak point.
I have used at various times a metal bar and hook fixed to elastic, a D ring and cord and a safety pin, as means to hold the inner apron, all on the inside, so the webbing I use as the strengthening in the waistband was not divided by making a slot.
Anne the Pleater :ootd:
I presume to dictate to no man what he shall eat or drink or wherewithal he shall be clothed."
-- The Hon. Stuart Ruaidri Erskine, The Kilt & How to Wear It, 1901.
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