Cut the pant leg straight at about 30 cm from the hem.
Turn the pant leg inside out and fold the leg so that the (sewn) side seams line up in the middle.
Now glue the pipe close to the right side of the fabric with the glue gun (don't be too economical with the glue, but make sure you make a straight line). Press the glued sides firmly.
You can now turn the pipe back to the right side, the bottom is now neatly closed.
Decide how big you want the flap to be and make a good fold there.
Using a seam ripper, remove 2 trouser loops from the trousers. You can also use a piece of tape or ribbon if necessary. Cut off at 7 cm and glue both ends a cm inwards so you don't have any frayed edges.
Glue the loops at the level of the fold. Glue on the front and the back. Make sure your loop is big enough for your cord to pass through.
Thread your cord through the loops and tie a double knot at the end of the cord.
Decorate your bag with lace, ribbon, buttons, labels, etc.
Ready to go out!!!