If the item is an obviously delicate item of clothing, of no more than medium weight fabric with small pleats, and particularly if it is worn longer than knee length, then it might be more correct to have it fasten on the left, and call it a pleated skirt.

However - if it is more traditional and very like a man's kilt, then I would think it would look wrong to fasten it on the left.

Personally, despite being on the distaff side, I only wear 6 to 8 yard kilts with deep pleats and usually a fairly heavy belt - so I close them on the right. I sometimes wear them over a kimono style garment and that is always closed left over right, so it would look rather odd to have the kilt the other way.

Another distinction I'd make is that with a kilt, should I need protection from the weather, I would put on a cloak or cape, with a pleated skirt I'd wear a coat. I don't know why I'd make the distinction - but I can't recall ever putting on a coat with a kilt. Perhaps it is again the not mixing of 'sides', as the coat would be the other way to the kilt.