Add gusset underarm when the garment is too tight.
For this clothing alteration the fabric was supplied by the client and the requirements were to insert 4 cm (1 ½ in) under the arm. However you will notice in the video, that the fabric at the underarm had been cut on one side, which meant I had to cut this away, and that meant I added more to the width to compensate for the piece that had to be cut away.
In this situation I added ONE triangular insert only, because of the style and shape of the dress. I also cut the gusset on the bias because the dress was cut on the bias.
Happy altering
Judith aka genie