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.