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Your Guide to Plus Size Style Sizing

Is there a difference between an XXL and a 2X? If you can find plus size clothing that fit in both the straight size section and the women’s plus size clothing section, which one should you shop? We’ve heard these questions and so many more like them from our community members because when it comes to sizing, things can get really confusing. And when it comes to plus size outfit sizing? Not only are there more limited options to choose from, but the sizing confusion increases!

With every brand’s fit varying slightly, it’s hard to know exactly what the cause of this size discrepancy is. These types of fit frustrations are among the many reasons Dia & Co was founded. To get a better understanding of how sizing works and how to find the best plus size clothing for you, we sat down with Dia & Co’s own designer Marita Aikonen.

Why does every brand’s size 14 fit a little differently?

This can be an extremely frustrating experience—especially when it comes to online shopping as you order the size you expect to fit and when you finally get the chance to try it on, you discover it’s not the right size. The truth is that every brand’s fit is unique. Each brand uses a fit model, a real human being with a fairly proportionate body type, to try samples on and adjust fit to.

With straight sizes, the fit model is generally a size 8 or a medium. With styles for plus size ladies, the fit model is generally a size 18 or a 2X. For this reason, samples are created generally in sizes 8 or 18 to be fitted on the fit mode. Because size 8 is in the middle of the size run for straight sizes and size 18 is in the middle of the size run for plus sizes, brands will grade up and down to determine the measurements of all of the sizes smaller and larger than the sample size.

Brands choose their fit models thoughtfully and they pick out a model based on her shape, with their target customer’s shape in mind. The goal, of course, is to get the most universal fit, so finding a fit model that is fairly proportionate is important. But, every designer and every fit technician will fit differently and will have a different intent. However, if the size 2X fit model is more bottom-heavy it could mean that the fit of the brand’s bottoms will be roomier and the tops will be a bit smaller. Therefore, there is true size discrepancy from one brand to the next and even within different categories of the same brand. In some brands, the knits (stretchier fabric that have give) will fit much larger than the wovens (stiffer fabric that has no stretch or give at all).

How does straight sizing differ from plus sizing?

In straight sizes, like in plus, garments are fitted on the sample size and then all of the sizes smaller and larger are graded up or down. So, a size M (generally a size 8/10) will be graded up by adding additional fabric evenly for a size L. If an inch is being added between a size M and L, then an inch will be subtracted from a size M to a size S. However, body types aren’t necessarily exactly that much larger or smaller.

When you take curves and proportions into account: in order to get the perfect fit, extra fabric will be required in specific places but not everywhere. For example, a size XXL blouse may have 3 extra inches added to the torso area but doesn’t need 3 extra inches in length on the sleeve. As our bodies get larger, our limbs don’t get longer. A woman that wears a size XXL will certainly be curvier than a woman that wears a size M, but the fit does not take those curves into consideration since the fit model used was not the curvier figure of a size XXL. If you are wearing a size XXL, you may be wearing an item that is oversized in the armhole and neckline and that may have too long sleeves. This is because the garment has been fitted to be a bit wider everywhere, but it likely is not wider (and narrower) in all the right places.

In plus sizes, however, the difference between sizes is not the same from size 0X (or 12) to a 5X (or 30/32). Instead, the difference gets a bit larger as the sizes get larger. Fit models for plus are generally a size 2X or 18/20, meaning that this fit model definitely has a curvier figure. Because curves are taken into account in in-style plus size clothing, you will notice a difference in fit. Plus sizes generally give a bit more room in the armhole, but the sleeve won’t be too long. As bodies get larger, they don’t also get taller and longer. This is, of course, common sense, but it’s not necessarily considered when a brand grades up from their straight-size fit model which is why sleeve lengths tend to be longer in straight sizes than in plus.