I measure in:
Very tapered fit
Very loose fit
Measure across back from outside of one shoulder to other.
Measure largest part; keep tape a little higher at back.
Measure 7" (18cm) below the waist or widest point of hips.
Measure jacket length from shoulder seam.
Measure coat length from shoulder.
Measure from top shoulder seam to end of shoulder seam.
Measure from shoulder seam to waist with arm bent (allow for padding).
Shoulder to Bust:
Measure from shoulders seam to bust line.
Bust to Bust:
Measure width of bust from one nipple to the other.