Um…a “14W” is supposed to be a 16, but cut fuller. As I understand it, the standard even sizes (4,6,8,etc) are cut to fit a size 8 fit model, and sized up and down accordingly. “Women’s sizes” (the ones with a W after) are cut to fit a size 20 fit model, and are sized up and down accordingly. If you are built more along the shape of a size 20 woman (big bust, broad back, and evidently gigantic upper arms), go for your size in W. If you are built more along the shape of a size 8 woman (small chest, narrow waist, broader hips, flat stomach), go for your size in the regular rack.
That said…every company has a different shape of fit model. I can’t wear anything at all from the Gap (or Old Navy, the same company) because they use flat-chested, flat-stomached, broad-hipped fit models. BUT…Liz Claiborne and Lee use fit models in my shape, so I get a size 14 and off I go. Easy.
So…try on a million pairs of jeans, but when you find a brand you like…that brand will fit you no matter what size you gain or lose into. It’s all about the company’s fit model.
Warning: I Am Not A Fashion Person! YMMV