I'm going to step in and explain what a fit model is and does
Each manufacturer chooses a fit model that best represents the ideal body type for their line. Ever just LOVE all the clothes from a certain manufacturer becasue they fit you just right? That will be because their fit model is similar to your body type. For example, DKNY will use a different fit model type than Patagonia.
A fit model will be somewhat 'average'; in the non plus size range she is usually a 10-12, and the patterns are graded up or down from this average person. (grading is the process of growing a pattern into the various sizes in a range of offerings) A fit model is usually average and well proportioned for her body type and size, but not a "model' by any stretch of the imagination for how we are used to thinking of that term.
Irulan
2015 Liv Intrigue 2
Pro Mongoose Titanium Singlespeed
2012 Trek Madone 4.6 Compact SRAM