There are a few different ways of sewing a gusset into your bags.
Firstly, there is the super easy boxed bottom method which I showed you how to do here.
And secondly, there is the method where you add a fabric panel and that's the one I'm going to show you how to do today.
I made this bag for Miss 8 but as there are so many processes involved (including lining, handles, pleats & template plastic bottom) I will not show you how to do all these as I'll be here forever and a day. Maybe I can revisit the project if anyone is interested in a sew-along.
So.... I didn't use a pattern and kind of made it up as I went along.
Cut two side panels the same length as the front and back (use whatever width you would like).
Cut 1 bottom panel, the long piece will be the same width as your front & back piece but the shorter end will be the same as the width of the side panels.
Aligh the fabric with the bottom. If your fabric needs trimming, do that from the top later. It is best that all pieces at the bottom fit perfectly.
Pin then sew both side panels to the front piece of fabric. Right sides together
Repeat this and join the back panel to the front & sides. Again right sides together.
Sewing the bottom panel on can be tricky, but there is a knack to getting perfect corners.
Pin the panel onto your main bag section.
You will see the natural folds of the gusset start to form
This is a little hard to explain so hopefully these images will help.
The two sides fold over to match each other with a loop of fabric inbetween (sorry best I could do!)
Sew through to the end and cut threads
When starting again, place your needle down into the fabric and lift foot.
Swing fabric piece underneath out of way and continue to sew until all sides are done and you are back to the start.
When you are done, press seams and turn in the correct way to admire your work. If you have any queries at all or something needs further explaining please don't hesitate to contact me.