To copy a garment you own, you can trace it (a rub-off) or photograph it and let a pattern tool draft the same style. A rub-off gives an exact copy of that garment, including its fit and every seam, and takes an afternoon of pinning and tracing; a photo gives a pattern in the same style drafted to your measurements in minutes, but it is not a replica of the original's construction. Choose the rub-off when the garment fits you perfectly and its details matter; choose the photo when you want the look in a different size, fabric or length, or when the garment is a standard shape.
| Feature | Rub-off tracing | Photo to pattern |
|---|---|---|
| What you get | An exact copy of that garment's pieces | A pattern of the same garment type and options |
| Fit | The original's fit, whatever it is | Drafted from your measurements with standard ease |
| Time | 2 to 4 hours for a dress, less for a skirt | Minutes, plus a toile |
| Tools | Pins, paper or cardboard, tracing wheel, ruler | A phone and a tape measure |
| Details copied | Every seam, dart, pocket, collar, as sewn | Only details in the tool's library |
| Garment types | Anything you can lay flat, including tailored pieces | Skirts, simple dresses, tops, sweats, pull-on trousers, bags |
| Seam allowances | You add them | Included |
| Changing the size | By grading, a skill of its own | Change the measurements, the pattern redraws |
| Risk to the garment | Pin holes in delicate fabric | None |
| Instructions | None; you reverse-engineer the order | A sewing guide with the steps |
What is a rub-off, and how does it work?
A rub-off (also called cloning or tracing a garment) copies a finished garment onto paper without taking it apart. You lay one section at a time on a padded surface, pin it flat along the grain, and trace the seam lines through the fabric with a tracing wheel or by running a pin along each seam into the paper underneath. Darts are traced as their two legs; curved seams are walked with the wheel. Then you true the pieces, check that seams that join are the same length, add seam allowances and mark the grainline from the garment's own weave.
It is a professional method; pattern rooms use it to copy samples. Its strength is faithfulness: you get the bodice exactly as it was cut, with the dart intake, the sleeve cap height and the pocket placement the designer chose. Its weakness is that you copy the fit the garment has, including anything you would have liked to change, and that you have no instructions for how it goes together.
How does a photo become a pattern?
A photo-to-pattern tool recognizes the garment type and its options from the picture: a shift dress, knee length, round neckline, short sleeves, back zip. A drafting engine then draws that garment from a block with your measurements and the ease that garment usually has. Nothing is measured from the photo; your numbers come from a tape. The result is a pattern of the same style, with seam allowances, notches, fabric amounts and a sewing order, ready to print.
The honest difference: the tool does not see how the garment was cut, only what it looks like. A dress with princess seams comes back with darts; a collar on a stand is not in the library and is left off. The photo to sewing pattern page lists what the tool reads and the what AI cannot do in sewing post lists what it does not.
How long does each method take?
A rub-off of a simple skirt takes an hour; a dress with sleeves and a collar takes an afternoon, and truing and adding allowances takes another hour. The first time, double that. The pattern is then exact, and you sew without a toile if the garment fits.
A photo takes a minute to upload and a few minutes of checking the draft and entering measurements. Then a toile of the bodice, because the drafted pattern has not been on your body yet. Total: an hour, most of it the toile. For a loose garment, such as a gathered skirt or an oversized sweatshirt, the toile can be skipped.
When does a rub-off win?
- The garment fits you perfectly and you want it again in another fabric. A rub-off copies the fit; a drafted pattern reproduces the style and the fit is standard until you refine it.
- The details are the point. A particular collar, a welt pocket, a yoke, a two-piece sleeve. The rub-off captures them; a drafting tool only has the details in its library.
- The garment is tailored or complex. Blazers, coats, fly-front jeans and shirts with collar stands are outside current AI libraries; a rub-off handles them.
- You cannot get a good photo. A black garment with topstitching in black thread hides its seams from a camera and shows them to a tracing wheel.
The copy a dress you love post is a worked example of a dress that was both photographed and measured.
When does a photo win?
- You want a different size. Grading a rub-off up or down is a skill; a drafted pattern redraws from new measurements.
- You want to change the design. Longer, with sleeves, with pockets, a fuller skirt. Options on a drafted pattern; a redraft on a rub-off.
- The garment is a standard shape. A T-shirt, an A-line skirt, a shift dress, pull-on trousers, a tote: a block already exists and tracing adds nothing.
- The garment is not yours. A shop listing, a friend's dress, a picture: no garment to pin.
- You want instructions. The drafted pattern comes with a step-by-step guide and a notions list; a rub-off comes with your memory of how the garment looks inside.
Can you combine them?
Yes, and it is often the best route. Photograph the garment to get a drafted base with the right type and options and the sewing guide, then measure a few things on the real garment with a tape: the finished length, the hem circumference, the sleeve length, the distance from the waist to the pocket opening. Compare those to the drafted pattern's finished measurements and adjust the options or the measurements until they match. You keep the exact proportions you liked without tracing, and you get a toile-ready pattern with allowances included. In Sewly the finished measurements of each pattern are listed next to the pieces, which makes the comparison a two-minute job. The dress form vs measurements post looks at the same question from the fitting side.
For details outside the library, rub off only that piece: trace the collar or the pocket from the garment and add it to the drafted base.
Which should you choose?
- A garment that fits perfectly, in a new fabric: rub-off. The fit is the thing you want to keep, and tracing keeps it.
- A garment with tailoring, a collar stand, a fly or welt pockets: rub-off, because no AI library drafts those yet.
- A standard shape you want in your size, a new length or with changes: photo. Faster, redrawable, with instructions.
- A garment you do not own: photo, by necessity, with a toile.
- A fitted garment that fits well, but you want options: both. Draft from the photo, then tune the finished measurements to the original.
- A beginner copying their first garment: photo, because it includes the seam allowances and the order of construction, which are where a first rub-off goes wrong.
Whichever you pick, sew a toile when the garment is fitted. A rub-off can hide a tracing error of 1 cm (3/8 in) that only shows on the body, and a drafted pattern has never met your shoulders. Hand drafting, as a third option, is weighed in the comparison with drafting by hand.