How to find your Measurements
Shoulder: Get the piece on a straight surface, measure the length of back, Measure the distance between the sleeve opening.
Length: Get the piece on a straight surface, measure the length of back, starting from the middle of collar and ending with the bottom edge of the outfit.
Bust: Make sure that buttons are fastened. Measure the distance between the two armholes, double it and you have the bust measure. 
Hips: Lower than the bust the hips are measured, same procedure in bust measuring.
Sleeves: Measure the distance of sleeve.