If you have fabric to spare it means that you can place the repeat of the pattern precisely where you want it on the aprons - both of them, and put the join of the fabric exactly where you want it too.

Do consider what is going on at the other end of the length of fabric before deciding just how much you are going to remove.

I make rather large under apron pleats on my kilts - first as I was reducing the size and did not want to cut the fabric, but I found that they are a good thing to have, so if you have spare fabric losing some in under apron pleats would be advisable.

For the size of the pleats - maybe if you try pinning in several pleats at the size you propose, then some just a little larger, and a little larger still you will be able to see what effect adding in that little extra will have on the apperance of the kilt.

Notice on the photo of the kilt Barb T posted how there are apparent breaks in the horizontal lines of colour, which might not be there if the pleats were smaller. That is the sort of thing that makes the colours interact when the pleats are in motion - makes them fizz.

Anne the Pleater