It really doesn't matter if the kilt is a four or five yarder or a eight yard tank. If the kilt is well made and fits the wearer properly, the vast majority of people will ever know the difference.

Over the period of a year I go to several formal events where there are 75 to 100 kilted gentlemen in attendance, it is very difficult to pick a four or five yarder out of the crowd. The ones that stand out are the guys who are wearing the kilt too low, too long, or are wearing a very sloppily put together outfit. If the outfit is reasonably correct, well fitting and worn with the proper accessories, you will never be able to pick them out of the crowd. They will fit right in.

Wear what works for you, there are no kilt police out there.