Apparel Buying Guide: How to Choose Clothing Size and Fit Online

Quick answer

Measure your chest, waist, and hips, then compare those numbers to the garment's own size chart instead of your usual letter size. When a chart is missing or a cut is described as relaxed, size up. When you are between sizes on a fitted garment, size up and plan to tailor down, because taking in fabric is easier than adding it.

Buying apparel online fails for one main reason: shoppers trust the size they wear at one store and assume it travels. It rarely does. A medium in a boxy tee and a medium in a fitted button-down can differ by several inches through the chest, even when both charts say medium.

This guide gives you a repeatable process: measure your body, read the garment's cut and fabric, and apply a few decision rules before you check out. It applies whether you are buying a basic tee, a structured jacket, or a gift for someone whose measurements you only half know.

Start with your own measurements, not your usual size

Take three measurements with a soft tape: chest at the fullest point, natural waist at the narrowest point, and hips at the widest point. Keep the tape level and snug but not compressing. Write the numbers down, because you will compare them against every size chart rather than guessing. If you are shopping for someone else, borrow a garment that fits them well and measure it flat instead.

Then compare your numbers to the garment's own chart, not to a generic conversion table. A chart that lists chest, waist, and length separately tells you far more than one that only lists S, M, L. If a listing gives body measurements rather than garment measurements, remember the finished garment will be slightly larger to allow for movement.

• Measure over light clothing, not a bulky sweater.
• Re-measure once; small tape slips cause most wrong-size orders.
• Save your measurements in a note on your phone for future orders.

Read the cut before you read the size

Cut describes how the garment is shaped, and it changes fit more than the size label does. A relaxed or oversized cut is drafted with extra room through the body and shoulders, so your true size may feel intentionally loose. A slim or tailored cut follows the body closely and leaves little room for error. Knowing which you are buying tells you whether to trust the chart or adjust it.

Look for specific words in the product description: relaxed, boxy, fitted, tailored, cropped, longline. Each one signals where the garment adds or removes fabric. If the description is vague and no measurements are listed, treat that as a real limitation rather than a challenge to guess through. Ask the seller for a flat measurement before ordering.

• Relaxed cut: your usual size will feel roomy; size down only if you want a closer fit.
• Fitted cut: size up if you are between sizes or want room to move.
• Cropped or longline: check the listed length, not just the width.

Let the fabric tell you how much forgiveness you get

Fabric determines how much a garment will stretch, drape, and recover. Knits with elastane move with you and forgive a slightly snug fit. Woven cottons and linens have little give, so they need to fit correctly from the start. Heavier fabrics hold a structured shape and show every pull line; lighter fabrics skim the body and hide small fit differences.

Shrinkage matters too. Natural fibers can shrink after a hot wash, while synthetic blends usually hold their size. If you are between sizes in an all-cotton woven garment, size up and plan to wash cold and hang dry. If the fabric is a stretch knit, your usual size is usually the safer bet.

• Stretch knit: close fit is fine; the fabric will move with you.
• Woven cotton or linen: size up when between sizes.
• Structured or heavy fabric: prioritize shoulder and chest fit over length.

Use a size chart the way it is meant to be used

A clothing size chart is a comparison tool, not a promise. Find the row where your chest, waist, and hips each land, then see whether they agree. If your chest points to a medium and your hips point to a large, choose the size that fits the area where the garment is most fitted. For a fitted top, that is the chest; for trousers, it is the hips.

Length is the measurement shoppers skip and then regret. Compare the listed body or sleeve length to a garment you already own and like. Two inches of difference changes where a hem sits and whether a sleeve covers your wrist. If length is not listed, that is missing information, not a detail you can safely assume.

• Chest, waist, and hips disagree? Fit the most fitted area.
• Compare listed length to a garment you already own.
• If a key measurement is missing, ask before you buy.

Decide when to size up and when to size down

Size up when the garment is fitted, woven, structured, or when you plan to layer it over another piece. Size down when the cut is described as oversized and you want a closer silhouette, or when a stretch knit already runs generous. When you cannot decide, size up: a tailor can take in a seam, but no one can add fabric that was never cut.

Think about how you will actually wear the piece. A shirt worn open over a tee needs more room through the chest than the same shirt buttoned on its own. A jacket worn over a sweater needs space in the shoulders and upper arms. Buying for the layered version prevents the common mistake of a garment that fits only in one styling.

• Plan to layer: size up.
• Oversized cut you want fitted: size down.
• Genuinely unsure: size up and budget for a simple alteration.

Decision rules for choosing clothing size online

• You are between two sizes: Size up for fitted, woven, or structured garments; size down only for an oversized cut you want closer to the body. Taking in fabric is easy; adding it is not.
• The size chart lists body measurements, not garment measurements: Expect the finished garment to be slightly larger than your body numbers to allow for movement. Do not size down to compensate unless the cut is described as oversized. Match the chart type to the cut description.
• You plan to layer the piece: Add room through the chest and shoulders by sizing up, especially for jackets and overshirts. Buy for the layered version, not the solo one.
• A key measurement is missing from the listing: Ask the seller for a flat measurement before ordering, or choose a different item with a complete chart. Missing data is a reason to pause, not to guess.
• The fabric is a stretch knit: Your usual size is usually safe because the fabric moves with you and recovers its shape. Stretch forgives; woven does not.

What our catalog shows about sizing and fit

• "The Mother" SCOBY Sticker: 3-inch vinyl die-cut sticker with a matte finish, weatherproof and dishwasher safe, printed in the USA and sold loose without individual packaging. A concrete example of why listed dimensions matter more than a category label. Measure the space where the sticker will go before you order, since a 3-inch die-cut has a fixed size you cannot adjust.
• Black Balsam Sticker: 4-inch vinyl die-cut sticker with a matte finish, weatherproof and dishwasher safe, printed in the USA. One inch larger than the 3-inch stickers in the same catalog. Comparing the two shows how a single measurement changes where a piece works, the same way a chest or length measurement changes whether a garment fits.
• Black Balsam Screenprint: Screenprint on soft white 110 lb. cardstock, 14 by 11 inches, unsigned and unnumbered open edition, with a small blind impression of the Starfangled Press logo. A listed size and paper weight let you plan framing and placement without guessing. Apply the same standard to apparel: if a listing does not state the measurement you need, treat it as unknown and ask.

Who this approach fits

Best for

• Shoppers ordering apparel online without trying it on first
• Anyone between sizes who wants a repeatable way to decide
• Buyers planning to layer a garment over other pieces

Not for

• Shoppers who can try the exact garment in person before buying
• Buyers who need made-to-measure tailoring rather than standard sizing

Measure your body, read the cut and fabric, and compare both to the garment's own chart. When the numbers disagree or a detail is missing, size up or ask before you buy. That single habit prevents most online sizing returns.