Measuring a doll with a tape measure and getting accurate measurements is difficult. And the smaller the doll, the more difficult it becomes.
But the other day, I was in one of our local quilt shops and I found this:
It's a narrow cotton tape that's being used as decoration on lots of quilts and bags and whatever else a quilter/sewer can think of. It's marked in 10cm (4") increments. It's pretty accurate - over the space of 10cms it is 3mm out (which equates to an 1/8" over 4" for those still using inches).
However, if I use it to measure a doll and then use it to make the measurements on the pattern, the pattern will fit the doll. And it is narrow and flexible enough to fit into the curves of a small doll so I can use it to measure small dolls (like Monster High and smaller) just like a tape measure.
And it gives Barbie a tape measure too! (Doesn't she look professional?)