Sewing Terms Every Beginner Should Know (A Plain Glossary)

Patterns, tutorials, and YouTube videos all assume you already know what a "basting stitch" or "selvage" is. If you don't, instructions that should be simple start to feel like a foreign language. This glossary covers the sewing terms for beginners that come up most often, explained in plain language with no background knowledge assumed.

Bookmark this page and return to it whenever a word stops you mid-project.

The Fabric and Thread Terms You'll See Constantly

Before you cut a single piece of cloth, patterns ask you to think about the fabric itself. A few vocabulary words make that much less confusing.

Grain line refers to the direction threads run in a woven fabric. The lengthwise grain runs parallel to the selvage; the crosswise grain runs perpendicular to it. Patterns print a grain line arrow on each piece, and you align that arrow with the lengthwise grain before cutting. Cutting off-grain causes finished garments to twist and pull.

Selvage is the finished edge that runs along both long sides of a fabric bolt. It doesn't fray, so it's stable, but it's also tighter than the rest of the cloth. Pattern pieces are rarely placed on the selvage; it mostly serves as your reference point for finding the grain line.

Bias describes any diagonal direction across fabric. The true bias sits at 45 degrees to the grain and has the most stretch in a woven fabric. Bias-cut garments drape beautifully but are trickier to sew. Bias tape is cut on this angle so it can curve around necklines and armholes without puckering.

Nap refers to a directional texture or pattern on fabric, such as velvet's pile or a plaid that has to match. When fabric has a nap, all pattern pieces must face the same direction, which typically uses more fabric.

Right side vs. wrong side simply means the side meant to show on the outside (right side) versus the back side (wrong side). Most sewing happens with right sides together so seam allowances end up hidden inside the finished piece.

Cutting and Measuring Vocabulary

Seam allowance

Seam allowance is the strip of fabric between the cut edge and the stitching line. Most home-sewing patterns use 5/8 inch (about 1.5 cm); quilting patterns often use 1/4 inch. If you sew too close to the cut edge, seams pull apart; too far inside, and your finished piece comes out smaller than intended. Your pattern instructions will specify the allowance, and your machine's throat plate usually has engraved guides to help you maintain a consistent distance.

Notches, marks, and notions

Notches are small triangles or diamonds printed on pattern edges. You transfer them to your cut fabric (a small snip into the seam allowance works well) so you can match pieces correctly when sewing. Single notches, double notches, and square notches each mean something specific in terms of which piece joins to which.

Notions is the catch-all word for everything except the fabric itself: thread, pins, needles, buttons, zippers, elastic, interfacing. When a pattern lists required notions, that's your shopping list.

Interfacing

Interfacing is a stabilizing material fused or sewn to fabric to add body. Collars, cuffs, and waistbands are typical candidates. Fusible interfacing bonds to fabric with a hot iron (always test on a scrap first, since iron temperatures vary). Sew-in interfacing is basted in place instead.

Stitch Terms You'll Encounter in Every Tutorial

Basting stitch is a long, temporary stitch used to hold pieces together for fitting or to ease one layer to another before permanent stitching. On a machine, basting is your longest stitch length. Hand basting uses long running stitches. Either way, basting is removed after the final seam is sewn.

Topstitch is visible stitching on the right side of the fabric, usually running parallel to a seam or edge. It adds decoration and keeps seam allowances lying flat. A standard seam allowance from the edge and a slightly longer stitch length are common starting points for topstitching.

Understitch is a row of stitching sewn through a facing and its seam allowances, close to the seamline, that keeps the facing from rolling to the outside. It's invisible from the right side of the finished piece.

Stay stitch is a single line of stitching sewn just inside the seam allowance on a curved edge, such as a neckline, before you assemble the garment. It prevents the bias edges from stretching out of shape while you handle the cut pieces.

Zigzag stitch is the wavy stitch most machines can make. At its widest, it's used to finish raw edges to slow fraying. At narrower widths it's used for elastic and some stretch fabrics.

Pattern and Assembly Terms

Right sides together (RST) means you place the two fabric pieces face to face, right sides touching, before pinning and sewing. This is the default position for most seams; the stitching ends up on the inside when you press the seam open and turn the piece right side out.

Press in sewing means to iron with a lifting-and-setting motion rather than gliding. A well-pressed seam looks flat and professional; an unironed one looks lumpy. Pressing as you go is a genuine skill that pays off in the finished result. Treat iron temperatures as starting points and always test on your actual fabric first.

Clip and notch refers to cuts made into the seam allowance after sewing curved seams. On an inward (concave) curve, you clip straight cuts close to the stitching to let the seam spread. On an outward (convex) curve, you cut small wedges out of the allowance to reduce bulk. Both let the seam lie flat after turning.

Ease is a small amount of extra fullness sewn into one piece to accommodate movement or to match it to a longer piece. When a sleeve is sewn into an armhole, the sleeve cap is typically eased around the curve. In fit terms, ease is the extra room built into a garment beyond the body's exact measurements.

Gathering means drawing up a length of fabric to a shorter measurement by using two parallel rows of long machine stitches, then pulling the bobbin threads. Gathered skirts, ruffles, and sleeve caps all use this technique.

Quick-Reference Glossary Table

Frequently Asked Questions

What does "finished seam" mean? A finished seam has treated edges that resist fraying, usually by zigzagging, serging, or using a bound edge. An unfinished seam leaves raw fabric edges that will fray over time, especially after washing. Whether to finish seams depends on the fabric and how the garment will be used; patterns sometimes specify an approach.

What is the difference between hem allowance and seam allowance? Seam allowance is the fabric between a cut edge and a seam that joins two pieces together. Hem allowance is the extra fabric at a bottom edge that gets folded up and stitched to form a finished hem. Patterns print separate amounts for each. Hem allowances are usually wider than seam allowances.

What does "cut on fold" mean on a pattern? The pattern piece is placed with one edge exactly on a folded edge of fabric. When you cut and unfold, you get a symmetrical piece twice as wide. You don't cut along the fold line itself. This technique is used for bodice fronts, skirt fronts, and other pieces that need to be mirror-image identical.

What is the difference between a facing and a lining? A facing is a separate fabric piece sewn to an edge (neckline, armhole, front opening) and turned to the inside to give a clean finish. It covers only a short distance from the edge. A lining is a separate layer that covers the entire inside of a garment and is usually attached only at the openings.

What does "ease in" mean versus "ease for fit"? Easing in means gently coaxing one longer piece to match the length of a shorter one without forming visible gathers. Ease for fit refers to the deliberate extra room patterns build in beyond your body measurements so garments are comfortable to wear and move in. The two uses of the word "ease" sound identical but describe different things; context usually makes clear which meaning applies.

Once this sewing vocabulary feels familiar, the next step is getting your tools and workspace sorted. The beginner sewing kit guide walks through what you actually need without overbuying. If you're still deciding between hand sewing and machine sewing, this comparison lays out the practical differences. And when you're ready to dive into your first real project, the complete beginner's roadmap maps out the whole learning path from threading a needle to finishing a garment.