Rib Knit Fabric: A Sewing & Care Guide
We often think of ribbing as a supporting player - the trim at a cuff or collar. But rib knit is far more versatile than that, and it's a joy to wear: comfortable, soft, stretchy, and flattering. This guide covers what rib knit fabric is, how the different rib types behave, and exactly how to sew and care for it, with expert tips from sewing instructor Shannon Gifford.
What is rib knit fabric?
Rib knit is a stretchy knit fabric made with alternating columns of knit and purl stitches, which creates raised vertical "ribs." Because the ribs run lengthwise, the fabric has excellent crosswise (widthwise) stretch and strong recovery - it springs back to shape - which is why it's the classic choice for cuffs, collars, and waistbands that need to hug and rebound. Most rib knits look the same on both sides, so there's no tricky right/wrong side to track while you sew.
Types of rib knit
Rib knits are described by the rib ratio - the number of knit columns paired with purl columns. The higher the numbers, the wider and more pronounced the ribs.
| Rib type | Structure | Character | Best for |
|---|---|---|---|
| 1x1 rib | 1 knit / 1 purl | Fine, even ribs; the stretchiest and most elastic | Cuffs, collars, neckbands, fitted tops |
| 2x2 rib | 2 knit / 2 purl | Slightly wider ribs, still very elastic | Trims and ribbed tops |
| 3x3 rib | 3 knit / 3 purl | Wider, more visible ribs; versatile enough for trim and garments | Tanks, tees, camisoles, cardigans, and trim |
| Poor boy rib | 6x6, very fine stitches | Wide-wale look with a soft, luxurious hand | Trim and great-looking sportswear |
A quick note on poor boy rib: it reads like a bold wide-wale ribbing, but it's actually a fine 6x6 rib, which is what gives it that soft, refined drape.
Characteristics & stretch
Rib knit's defining traits are stretch and recovery. EOS's cotton rib stock, for example, typically has about 30% widthwise stretch with limited lengthwise stretch - plenty of give around the body, stable along the length. The ribs also let the fabric close up and open with movement, which is part of what makes ribbed cuffs and bands grip so well.
What to make with rib knit (pattern suggestions)
Rib knit shines as trim - cuffs, collars, neckbands, waistbands, and hem bands - but it's also wonderful for whole garments: tanks, tees, camisoles, polo shirts, turtlenecks, cardigans, and casual sportswear. One tip specific to the finer poor boy rib: avoid patterns with strong horizontal lines (such as horizontal bust darts), as they fight the natural vertical stretch of the ribbing.
How to sew rib knit fabric
Pretreatment
Always pretreat before you cut. For most rib knits, prewash in cold water and tumble dry on a cool setting. Some darker colors may fade slightly the first wash - if your swatch is one of these, handwash the fabric and lay it flat to dry instead. Poor boy rib needs extra attention: it shrinks in width when washed, which makes the ribs more pronounced. If you like that more textured look, prewash the full yardage in a cold wash with no bleach. If you'd rather keep the fabric's original appearance, handwash it. Either way, dry poor boy rib by laying it flat on a towel - skip the dryer.
Needles & thread
Use jersey (ballpoint) needles, size 11/75 for construction; stretch needles in size 11 also work well. For hems and topstitching, stretch twin needles in 2.5/75 and 4.0/75 are excellent choices. Thread with cotton-covered polyester or all-polyester thread for a little built-in give.
Seams, seam finishes & hems
Construction (conventional machine): zigzag stitch, 2.0 length x 1.5 width. For standard straight seams, lengthen your stitch to about 3.5 so the seam can stretch with the fabric.
Construction (serger): a 3-thread balanced stitch is ideal.
Seam finishes: none needed - rib knit does not ravel.
Hems: use a stretch twin needle (4.0/75, or 2.5/75) or the same zigzag used for construction. On poor boy rib, the wider 4.0/75 twin needle nicely matches the width of the ribs. A coverstitch machine, if you have one, makes a beautiful hem on rib knit.
Interfacing
Generally, rib knit doesn't need interfacing - and on the finer poor boy rib, fusible interfacing is best avoided entirely, since it flattens and interferes with the rib texture. If you need extra stability: on 3x3 rib, you can stabilize a hem with a crossgrain strip of the lightest-weight knit fusible available (So Sheer is a good choice). On poor boy rib, use a sew-in approach instead: a layer of swimwear lining or lightweight Lycra, with its stretch matched to the rib knit's stretch.
Creative possibilities
- Bands & bindings (3x3): cut on the crossgrain at twice the desired finished width plus two seam allowances, fold in half lengthwise, and stitch to the garment (conventional machine or serger).
- Neckline binding (3x3): cut the band to 3/4 the length of the neckline opening and stretch the ribbing slightly as you sew, so the band hugs the neck when worn.
- Covering piping (3x3): the rib's stretch makes it great for wrapping piping.
- Lettuce edge: set your overlock/serger to a rolled hem and stretch the fabric edge as you stitch for a pretty ruffled finish.
- Imitation smocking (poor boy): stitch two ribs together and secure with a few backstitches; repeat along a horizontal line, then work several rows, alternating the stitching to create a honeycomb effect.
Caring for your rib knit
Machine wash gentle (or handwash for darks and for poor boy rib), and hang to dry or tumble on low. Avoid hot irons, hot dryers, and fusibles - heat and harsh fusing are what damage the rib texture over time. Do not bleach.
Shop rib knit fabric
Browse EOS's rib knits and ribbing - cotton ribbing for collars, cuffs and hems, sold by the half-yard - or explore the full knit fabric collection. Back to all fabric care guides.
FAQ
What is rib knit fabric?
Rib knit is a stretchy knit fabric with raised vertical ribs formed by alternating knit and purl stitch columns. It has strong crosswise stretch and recovery and usually looks the same on both sides.
What's the difference between 1x1, 2x2, 3x3 and poor boy rib?
The numbers are the rib ratio - knit columns to purl columns. 1x1 is the finest and stretchiest; 2x2 and 3x3 have progressively wider, more visible ribs; poor boy is a fine 6x6 rib that looks wide-wale but feels soft and luxurious.
Is rib knit stretchy?
Yes - rib knit has excellent widthwise stretch and good recovery. EOS's cotton rib stock typically has around 30% widthwise stretch with limited lengthwise stretch.
What is rib knit used for?
Most often for cuffs, collars, neckbands, waistbands and hem bands, but it also makes great tanks, tops, camisoles, cardigans, turtlenecks and casual sportswear.
How do you wash rib knit?
Prewash before cutting; wash gentle in cold water and tumble on low or lay flat to dry. Handwash darker colors and poor boy rib, and avoid hot irons, hot dryers and bleach.