I get this question a lot since we do Scottish weddings. The answer is don't bother. First pink, peach mauve, mint and any of the other pastel colours that are so common with weddings don't show up much in kilts at all, never mind those available for rent. So unless you want to find a tartan in pink and have them made it is unlikely you will succeed. Besides it isn't needed. As you are Campbells it would be much more appropriate to wear the Campbell tartan. Amazingly this means you will find it for rent very easily if you don't want to purchase the outfits.

In order to get the colour the bride wants into the outfit make it part of the boutonniere the Groom's party wears.

Oh and why is the Campbell so easy to find? It's known more commonly by another name.