Where to take in pants and how much fabric you have to work with

You can sew pants smaller at the waist, the inseam (the inside seam running from crotch to ankle), the outseam (the outside seam), or all three. The amount of fabric available to take in depends on where the seam currently sits and how much excess material is hidden inside the pant leg or waistband.

The waistband usually has 1 to 2 inches of extra fabric folded inside it—this is the easiest place to remove width. The inseam and outseam each typically have a seam allowance of 0.5 to 1 inch on either side of the stitching line, meaning you can usually take in up to 1 inch total per seam without cutting into the original stitching. If you need to remove more than 2 inches from the waist or more than 1 inch from the legs, the pants may not have enough fabric, and taking them in further risks splitting the seams under wear.

Key Takeaways

  • The waistband is the simplest place to remove width because extra fabric is already folded inside; you can usually take in 1 to 2 inches there alone.
  • The inseam and outseam each have a seam allowance of roughly 0.5 to 1 inch, so you can remove up to 1 inch per seam without cutting into the original stitching.
  • Measure how much smaller you need the pants to be before you start, then divide that amount evenly between the seams you plan to alter.
  • Sewing the inseam requires you to try on the pants and mark the new length while wearing them, because the crotch point shifts when you sit.
  • If you need to remove more than 2 inches total, the pants may not have enough hidden fabric, and a tailor is a safer choice than risking a split seam.

How to take in the waist

Turn the pants inside out and try them on. Pinch the excess fabric at the side seams—usually the back waist has more excess than the front. Mark where the new seam should sit with a fabric pen or tailor's chalk, keeping the line parallel to the current seam. If you need to remove 1 inch total, mark 0.5 inches inward on each side seam.

Sew along your marked line using a straight stitch, backstitching at the start and end. Try the pants on again before trimming. Once you confirm the fit, trim the excess seam allowance to about 0.5 inches and finish the raw edge with a zigzag stitch or pinking shears to prevent fraying. If the waistband itself is too loose, you can also open the waistband seam, remove fabric from the inside fold, and re-stitch it closed—this method is slower but gives you more control over the fit.

How to take in the inseam

The inseam is the seam that runs up the inside of your leg from the ankle to the crotch. Taking it in makes the pants narrower through the thigh and calf. Try on the pants inside out and have someone help you mark the new seam line with a fabric pen, or use a mirror to mark it yourself. The line should run parallel to the current seam and taper slightly—wider at the thigh, narrower at the ankle—to keep the pants from looking bunched.

Sew along your marked line, starting at the ankle and working upward. Use a straight stitch and backstitch at both ends. Try the pants on again to check the fit before trimming. Once you are satisfied, trim the seam allowance to 0.5 inches and finish the edge. If the pants fit well through the thigh but are too wide only at the calf, you can take in just the lower half of the inseam instead of the whole leg.

How to take in the outseam

The outseam runs down the outside of your leg. Taking it in is similar to the inseam: try on the pants inside out, mark the new line parallel to the current seam, and sew along it. The outseam is often easier to mark yourself because you can see it in a mirror, and it usually needs less tapering than the inseam because the outer thigh is flatter.

Sew, try on, and trim the same way as the inseam. If you are taking in both the inseam and outseam, divide the total amount you need to remove evenly between them—if you need the leg 1 inch narrower, take in 0.5 inches from each seam rather than 1 inch from one seam. This keeps the pants balanced and prevents them from twisting around your leg.

How to shorten the inseam (the hem)

Shortening the inseam is different from taking it in. You are removing length, not width. Try on the pants with the shoes you plan to wear them with, and have someone mark where the hem should sit—usually just touching the top of your shoe. Measure the distance from that mark to the current hem, and subtract 0.5 inches (the seam allowance for the new hem).

Turn the pants inside out and fold the leg up to the new length. Pin the fold in place and try the pants on again to confirm the length is correct. Sew the new hem using a straight stitch, sewing parallel to the fold about 0.5 inches from the edge. Trim the old hem away, leaving about 0.5 inches of fabric above your new stitching, and finish the raw edge with a zigzag stitch or pinking shears.

Combining multiple alterations

If you need to make the pants smaller in width and shorter in length, do the width alterations first (waist, inseam, outseam), then shorten the inseam last. This order matters because taking in the side seams can shift where the crotch sits, which changes how long the pants should be.

After you finish the waist and leg seams, try the pants on again and re-measure the inseam length before you mark and sew the hem. If you skip this step, the hem may end up uneven or the wrong length.

When to stop and call a tailor

If you need to remove more than 2 inches from the waist or more than 1 inch from each leg seam, the pants do not have enough hidden fabric to safely take in. Sewing seams that close to the original stitching risks the seams splitting under normal wear, especially at stress points like the crotch and the inside of the thigh.

A professional tailor has access to techniques like adding gussets (extra fabric panels) or re-grading the pattern, which allow them to alter pants beyond what home sewing can safely do. If the pants fit well everywhere except one area—for example, the waist is perfect but the legs are too wide—a tailor can also make targeted changes that preserve the original fit everywhere else. The cost is usually between $20 and $50 per alteration, depending on your location and the complexity of the work.

Frequently Asked Questions

Can I take in pants that are stretchy or have spandex?

Yes, but use a ballpoint needle (not a sharp needle) to avoid snagging the fibers, and use a stretch stitch or a narrow zigzag instead of a straight stitch. Stretch fabric needs some give in the seam, or the thread will break when you move. Test your stitch on a scrap of the same fabric first.

What if one leg is longer than the other after I sew?

This usually means the crotch point shifted when you altered the waist or side seams. Try on the pants with the shoes you will wear them with, and mark the correct length on each leg separately—they may not be the same. Hem each leg to its own correct length rather than trying to match them.

Do I need a serger to finish the seam edges?

No. A serger is faster, but a zigzag stitch on a regular sewing machine works just as well for preventing fraying. Pinking shears are also a quick option if you do not want to sew. All three methods keep the raw edge from unraveling over time.

Can I take in pants at the crotch seam?

The crotch seam is a stress point and already has minimal seam allowance. Taking it in risks the seam splitting during normal wear. Alter the inseam and outseam instead, which spreads the change across a longer seam and is much safer.