The Ultimate Boutique Sizing Guide

Marketplaces enforce sizing standards across thousands of vendors, which makes their sizing more comparable but also more abstract. Boutiques source from a handful of makers per season, and each maker runs to its own size chart. A boutique 'medium' is the maker's medium, which is rarely the same as the marketplace's medium.

This is not a flaw — it is a function of the small-scale model. The trade-off is that you need to recalibrate per shop instead of per platform. The good news is recalibration is fast: one order tells you most of what you need to know about a shop's sizing.

Most boutiques publish a fit guide on every product page. The useful ones include the model's height, the size she is wearing, and a note on whether the piece runs small, true, or large. Read all three before ordering — they are more accurate than the size chart in isolation.

If a shop only publishes a numeric size chart without a fit note, the safest assumption is that the piece runs true to the maker's chart but not necessarily true to your usual size at other shops.

Fabric content is the single best predictor of how a piece will behave after the first wash. 100 percent cotton shrinks. Rayon and viscose drape and grow. Polyester blends keep their shape but breathe poorly. Cashmere and merino soften with wear. Knowing what the piece is made of tells you what to expect long before you read the size chart.

If a boutique does not publish fabric content for a piece, ask. The owner usually knows by heart.

Structured pieces (blazers, button-downs, fitted dresses, denim) — size up if you are between, especially in pieces that are dry-clean-only or non-stretch.

Knits (cardigans, sweaters, oversized tees) — true to size or down. Knits stretch with wear, so a snug fit out of the box usually relaxes into a perfect one.

Loose silhouettes (kaftans, swing dresses, A-line) — true to size on the bust measurement, which controls the rest of the drape.

Outerwear — size up if you plan to layer; true to size if it is a final layer.

If you measure between sizes, default to the larger size on structured pieces and the smaller size on knits. The same logic applies to length — if you are between standard and tall, size to the longer length on dresses and the shorter on tops.

For pieces you cannot easily return, size to the measurement that is hardest to alter. Bust and hip are harder to take in than waist; height is harder to add than to hem.

Post-partum sizing is its own category. Bodies recompose for months after birth, and rigid sizing is the wrong tool. Look for boutiques that publish post-partum-specific fit notes, and prioritize pieces with elastic waists, wrap silhouettes, and natural-fiber knits that move with you.

Some boutiques carry intentional 'mom' lines that are sized for these bodies. Those are often easier than trying to size traditional pieces during the first year.

Plus-size boutique sizing has improved in the last few years but still varies widely. Filter the directory at /directory for boutiques that explicitly carry plus-size sizing rather than treating it as an add-on. Shops that lead with plus-size as a category usually fit better than shops that extended an existing line.

Read reviews from plus-size customers when available — they tend to be the most useful sizing signal because they have already navigated the variability.

Western sizing — particularly boots, hats, and belts — is closer to footwear and headwear than to apparel. Each brand runs to its own chart and the variance is wide. Always check the brand's own size chart, not the boutique's generic one.

For boots, size to the foot that runs larger and break them in over the first month. For hats, measure the head circumference at the widest point. For belts, size to your jeans size plus two inches for the buckle overlap.

If you are between sizes on a piece that matters, message the boutique owner. Most boutiques will tell you which way the piece runs, whether the model is wearing her true size, and whether the fabric grows. The reply is usually within a day and saves a return.

Owners want to get the fit right the first time because returns are expensive for small businesses. Asking is the right move — it is not an imposition.

Once you have ordered a few times from a boutique, write down what size you wear in their pieces and which silhouettes work. A small note in your phone titled with the boutique's name is enough.

After a year, you have a personal fit memory across your rotation, which collapses the sizing problem from a research task to a quick lookup. The shoppers who get the most out of boutiques almost all keep some version of this list.

Boutique return policies are tighter than marketplace policies. Most are 14-to-30 days with the item in original condition, and many issue store credit rather than a refund on the original payment method. Read the policy before the first order so the expectations are right.

If a piece does not fit and the boutique offers exchanges, those usually beat returns for both you and the shop. The owner gets to keep the sale; you get the piece in the right size.