The pinafores are altogether a more complex product - from the seamstresses point of view that is.
There is a bodice - lined - with a gathered skirt attached at the Empire line. The garment zips up the back and here is a photo of that concealed zip. The cutting and stitching has to match the tartan horizontals and verticals exactly. You would noy expect anything less if it is made in the home of tartan.
As mentioned elsewhere there are only two sizes for now - six to twelve months and twelve to twenty four months - and three colours; Red (Royal Stewart), green (Black Watch) and heather ( Isle of Skye).