Sewing a triangle gusset on leggings doesn't have to be hard. This method requires only three quick easy steps to attach the gusset.
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The easy way to sew a triangle crotch leggings gusset: Aila tutorial - The Last Stitch
How to add a gusset to a legging pattern - Life Sew Savory
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The easy way to sew a triangle crotch leggings gusset: Aila tutorial - The Last Stitch
Tutorial: Sewing a Triangle Gusset
The easy way to sew a triangle crotch leggings gusset: Aila tutorial - The Last Stitch
The easy way to sew a triangle crotch leggings gusset: Aila tutorial - The Last Stitch
Breezy Tank, Athleta
The easy way to sew a triangle crotch leggings gusset: Aila tutorial - The Last Stitch