Ralph Lauren Sizing: Does Ralph Lauren Run Small, Big or True to Size?

Ralph Lauren sizing depends on the line and the shape, so I would not buy by the letter alone. The official size chart maps Polo Ralph Lauren women's numeric sizes to bust, waist and hip measurements; its fit note calls Polo slim and modern, and says to size up for a looser feel. Lauren is described as comfortable, with a suggestion to choose one size smaller, while the same guide says to stay true to size in outerwear. The guide also breaks out petite and extended-size options, which matters because the same number can sit differently across categories. Nordstrom's product notes show the variation in practice: its Oxford Cotton Button-Up Shirt runs slightly small, but Easy Care Stretch Cotton Shirt is marked true to size and uses stretch poplin. So the ralph lauren size chart is my starting point, not the whole answer. I would compare measurements, read the individual fit note and then check the chart for the particular item.

Shirts are the clearest place to see how much the cut changes the advice. Nordstrom's Oxford Cotton Button-Up Shirt is 100% cotton and fit feedback says it runs slightly small, so I would start with measurements before assuming your usual Polo size. Easy Care Stretch Cotton Shirt uses wrinkle-resistant poplin with 95% cotton and 5% elastane, and the product page marks it true to size. Bloomingdale's Cotton Corduroy Classic Fit Shirt was stocked through XXL, although that final size was low when checked. Macy's Slim-Fit Oxford Shirt showed size 00 selected with other sizes available, which fits the difference between a classic cut and a slimmer one. If you want room through the shoulders or plan to layer, the classic cut is the safer bet; for a close shirt, compare the slim style's chest and sleeve notes before choosing. Avoid treating all button-downs as a single fit.

On knits, size notes are more specific than a brand-wide verdict. Nordstrom shoppers say Julianna Cotton Cable Sweater runs slightly small, while its Cable Knit Cotton Sweater is marked true to size; both product pages show sizes XXS through XXL. Bloomingdale's Wool & Cashmere Cable Knit Polo Collar Sweater had XXS available, and Cashmere V Neck Cardigan showed XS available. The practical distinction is not only the letter on the tag but how close you want the sweater to sit. I would size up in the Julianna if I prefer ease, use my usual size in the true-to-size crewneck, and compare a cardigan's shoulder and body measurements if I plan to wear it over a shirt. These four knits cover close cable texture, a polo collar and a softer open-front layer, so there is no reason to force one size choice across them.

Outerwear gets a different rule: Ralph Lauren's official guide says choose your true size in outerwear, even though it suggests sizing down for Lauren's comfortable fit generally. Nordstrom shoppers describe the Wool Blend Wrap Coat as true to size, and its City Crepe Straight Leg Pants are also marked true to size, with Petite and Regular sizing and a Short inseam. Bloomingdale's Wool Geo Motif Cardigan Coat had XS available, while Macy's Single-Breasted Walker Coat had size 2 available at the time of checking. My rule is to follow the garment note, not a label-wide shortcut: size up only when the cut or an extra layer calls for it, then compare the shoulders, back length and waist of a similar piece at home. If you are between sizes, decide first whether you want a close silhouette or room for a knit. For a first try, the wrap coat offers the clearest true-to-size note, and the straight-leg pants are useful if you need a Short inseam.