Adding a trimmed side vent to trousers

Split trouser hems can add a touch of glamour, adding a trim takes it up a notch! This variation is for a double jersey fabric construction like a Ponte Roma or similar

Make a Front Vent with a Loop and Button - Threads

Adding a Side Slit to Shorts–3 Methods — Crafty Staci

Journal

Patrol Pant - Men's Ski Pants

Adding a Side Slit to Shorts–3 Methods — Crafty Staci

How to Make Bias Binding & Button-Loops - Folkwear

How to Sew Flat Piping Trim to a V-neckline - WeAllSew

The Pull-on Trouser

Make a Front Vent with a Loop and Button - Threads