
When you order an Eres swimsuit online, you receive the package, try on the model, and the fit does not match what you expected. The problem rarely comes from an ordering mistake: it stems from a sizing unique to the brand, which does not follow the classic ready-to-wear benchmarks. Understanding this discrepancy before purchase avoids a return, or even a poor permanent choice on a swimsuit that costs significantly more than average.
The Eres Sizing Compared to Classic Ready-to-Wear
Eres uses a sizing system that is unique to them. The correspondence with standard French sizes exists, but it remains misleading. Several users on resale platforms report that an Eres swimsuit in size 44, for example, fits smaller than the same size in other brands.
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This discrepancy particularly affects silhouettes with volume in the bust or hips. The shaping material of Eres models compresses more than classic jersey, which accentuates the feeling of tightness, especially during the first fitting.
Before relying on your usual size, you save time by consulting the brand-specific size charts. A detailed guide explains how Eres sizes on Eleganzia and helps navigate the different cuts.
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Natural Soft Skin and Shaping Materials: Their Impact on Size Choice
Eres designs its swimsuits in technical materials that sculpt the silhouette. The range in Natural Soft Skin, used in several recent models like the Azur or Edina, offers a more pronounced fitting effect than the fabrics from previous collections.

In practice, this fabric hugs the body very closely. On a one-piece, the compression around the stomach and back can give the impression that the swimsuit is too small, even though the size is technically correct. If you are looking for immediate comfort without a period of adjustment, choosing one size up from your usual size is often the right reflex.
Returns vary on this point: some customers prefer the firm support of their exact size, while others find the compression excessive after an hour of wear. Tolerance to compression is personal, but the fabric hardly relaxes over time, unlike a classic elastane swimsuit.
Eres One-Piece or Bikini: Two Different Sizing Logics
You do not choose the size of an Eres bikini the same way you do for a one-piece. For a two-piece, each element is selected separately, allowing you to adjust the top and bottom to two different body types (slender bust and wide hips, or vice versa).
Size of the Eres Bikini Top
The bikini top primarily depends on the bust measurement and cup size. For triangle or bandeau models, the support relies on the cut and tightening ties, not on a structure. Generous busts (cup D and above) should aim for models with adjustable straps for proper support.
- Measure your underbust and bust at the fullest point, then compare these measurements to the Eres size chart (not a generic chart).
- If in doubt between two cup sizes, opt for the larger size to avoid the flattening effect of the shaping fabric.
- Models with integrated underwire offer better support but are less forgiving of size discrepancies: measurement accuracy is more critical.
Size of the Bikini Bottom or One-Piece
The bottom is chosen based on the hip measurement taken at the widest point. The Eres bikini bottom is cut quite high on most models, meaning that the fabric covers less area and any sizing mistake is immediately noticeable (unsightly folds if too large, marks if too tight).

For one-pieces, the length of the torso also comes into play. A tall woman with a long torso may find a swimsuit that pulls on the shoulders even if the hip measurement is correct. In this case, going up a size resolves the length issue without creating too much looseness elsewhere.
Check Your Measurements Before Ordering an Eres Swimsuit
The majority of sizing errors come from approximate measurements, with a measuring tape poorly positioned or clothing worn during the measurement.
- Take your measurements directly on the skin, standing, without sucking in your stomach. The measuring tape should be horizontal and flat, without tightening or floating.
- Measure three areas: bust (at the fullest point), underbust (below the bust), and hips (at the widest point, often lower than you think).
- Compare these three measurements specifically to the Eres size chart, not to a universal chart found on another site.
- If the measurements fall between two sizes, the larger size remains the safest choice at Eres due to the brand’s fitted sizing.
Some specialized lingerie and swimsuit retailers offer personalized assistance when you are unsure between two sizes. This service is worth using, especially for a first Eres purchase where you have no reference.
A well-fitted Eres swimsuit should neither compress to the point of hindering breathing nor leave gaps between the skin and the fabric at the back or crotch. The best indicator remains freedom of movement: raising your arms, sitting, bending. If the swimsuit rides up or pulls in any of these positions, the size is not right.