Lots of pink tartan here:
http://www.tartantown.com/list1_dress_thumbs.html

Dress Cooper is mostly blue with a pink stripe, very subtle:
http://www.tartantown.com/tartan_dress_thumbs.htm

Some almost pink tartans:
http://www.bentneedledesigns.net/Fabric.html

If you go with the box pleat style you'd only need 4yds, or 2yds of double wide fabric. Quite economical.