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

Reformation sizing is generally true to size, but a particular item can still run small or roomy enough to change the answer. The regular alpha chart runs from XS through XL and includes 1X, 2X, and 3X; the numeric chart covers U.S. 0 through 24. There is also a petite chart from XSP through XLP and a separate denim chart, with regular waist sizes 23 to 31 and extended sizes 32 to 38. These are reference points, not a promise that every dress and pair of jeans has the same ease. Blair High Waist Bootcut and Cary Wide Leg are marked true to size, while Bex has a size-down recommendation. The brand's size guide asks shoppers to measure bust, waist, and low hip, which is more helpful than guessing from a familiar label. I would start with those measurements, then read the style note and consider the fabric. The chart is a starting point; the garment's cut decides the rest. See Reformation's size guide.

Start with rise, fabric, and leg shape, because Blair High Waist Bootcut Jeans, Bex Wide Leg Jeans, Cary Slouchy High Rise Wide Leg Jeans, and Val '90s Mid Rise Straight Leg Jeans make different fit promises. Blair is listed true to size, with a full-length bootcut shape. Bex is the exception: customer feedback says true to size, while fit experts recommend one size down. Cary is marked true to size, but its nonstretch cotton and 32-inch inseam make the waist and length worth checking separately. Val is also listed true to size, with relaxed straight legs in nonstretch denim. The number on the tag cannot tell you whether you like a higher rise or how rigid denim feels after lunch. My practical tip is to measure the waist and inseam of jeans you already reach for, then compare that pair with the style measurements. Decide whether you want the fabric to hold its shape or give a little before choosing a size.

An oversized label does not guarantee an easy fit in every size. Jo Oversized Wool Sweater is intentionally slouchy, yet its fit note calls it small; I would consult the chart instead of assuming the loose silhouette means sizing down. Clara Cashmere Crew Cardigan is marked true to size and offers a steadier comparison if you want to begin with your usual top size. Jadey Oversize Cashmere Sweater has an oversized V-neck shape, and shoppers describe it as slightly large. Micah V-Neck Sweater goes the other direction, with a small-fit note despite its simple shape. Nordstrom's comments differ from style to style, which is exactly why I would not size by fiber or silhouette alone. Think about wearing a knit alone or over a shirt, then choose the amount of ease you want. The fit note is a more useful first clue than the word oversized.

For dresses, treat the bodice and fabric as the sizing test, not the word midi or maxi. Fit experts recommend going up if between sizes in Frinn Mock Neck Maxi Dress, a soft knit with a draped skirt. Birdie Fit & Flare Linen Midi Dress has smocked side panels and a flowy skirt, but is still marked small. Iris One-Shoulder Dress is curve-hugging and carries a size-up note, as does figure-skimming Lela Midi Dress. A skirt can move freely while the bodice stays close, and stretch does not automatically mean a loose fit. Compare your bust and waist with the brand chart and think about how the top will feel seated or with your arms raised. I would choose for the part of the dress that is hardest to alter, then leave length or straps for a tailor if needed. Start with the neckline and fit you actually want, not a size label that feels familiar.

If this one was useful, I also put together Sézane vs Reformation and Reformation Black Friday 2026.