There's a "lasses wear" thread that might give you some ideas. While some commercial dress patterns are clearly not suitable for tartan (too many seams to match, etc.), there are many that would look great in your clan's fabric. I think it's more a matter of selecting a style that is complimentary to the specific wearer, then finding a pattern that lends itself to being made in tartan.
Have a look through here to get started.















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