Right. Ive made costumes and things in the past, from scratch, just improvising and pinning stuff on the kids. Since watching the Sewing Bee, Ive bought a pattern, and am going to run up ha ha a dress for DD14. Got the pattern, got the fabric, this is where it gets confusing! 
I have measured DD. Her teeny bust is 31 inches. Her waist is 27 inches, her hips are 34 inches. Which, according to the chart on the pattern makes her a size 8 bust, size 14 waist and size 10 hips!
I measured her bust and hips at the widest bits and her waist at the smallest point.
So. If I make her a size 8 dress, which has a fairly empire line waist and flared skirt, is it going to fit?? And if not, what do I do?

It is this pattern.