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I sewed a pair of pyjama pants recently and made a single straight stitch along the crotch and backside. The pyjama pants are made out of cotton.

While sitting in them, they split open. I’d like to know how to reinforce and how to sew my stitch on the crotch and the seam in the back so that this does not happen again.

Why is my seam not strong enough?

Thank you for your help.


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  • Missing

    Dec 11, 2013, 02.26 PMby Kate Dicey

    The seam needs to be able to stretch, so you need to use a stretch technique, as if you were sewing something bias cut. Use a small sitch with a very narrow zigzag, and sew the seam TWICE! Make the second row of stitching 1/16" into the seam allowance from the first, or press the finished seam allowances to one side and top stitch from the outside.

    2 Replies
    • Sankofa3_large

      Dec 11, 2013, 09.23 PMby Jambalaya

      Thank you for this information, I’ll use it to repair my pants. Thank you

    • Missing

      Jan 1, 2014, 06.36 AMby peterjohny

      I was also going same type of problem while sewing my pants and I like your idea and I will also use it but one of my friend told me that I can also use belt technique in pyjama to resolve this problem so would it be possible?reply.

  • Aek_4345_large

    Jan 8, 2014, 03.39 PMby clothingengineer

    When I make pants I usually add 1/4" cotton twill tape while I’m stitching the center back seam. You could also stitch the seam and then do a second run of stitching to apply the tape if that’s too many layers for you to handle at once. This also has the benefit of stabilizing the crotch curve so that it doesn’t stretch out and bag after a couple hours of wear.

    I usually sew with 3/8" seam allowances. After I sew the crotch curve I serge the edges, fold it to one side, and then topstitch about 1/8" from the edge. This not only helps the seam stay flat for comfort reasons but also helps strengthen it a bit more.

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