I know Matt has posted some wide pleat options, I am making a 8 yard traditional knife pleat , and I've pinned some further tests showing a narrower pleat.
The wide green line isn't really wide enough to have it as a complete pleat, except if there were rather a lot of very narrow pleats, but I suppose that is still an option!
The triple purple works best I think if the pleat become centred, as the complete arrange is a little too wide to make a good number of knife pleats.
The half and half manages to maintain most of the colours in a balanced form.

Of course the final decision is down to my client, but it's always interesting to see the various options!