When a tee shirt too small, panels can be added to increase the size.

Unpick the side seam and the sleeve about half way

y to the shoulder seam on either side.  Cut out a panel from fabric similar to the fabric or in a contrast.  Allow around 7.5 cm (3") at the top (slightly curved for the armhole, and make a little wider as you come down the panel.  Because you have unpicked the sleeve, you can ease the new panel into the sleeve.  I have done this with a few tee shirts that I bought but found they were too small because I have a big bust.

Most of the clothes I wear are black, so I had no trouble matching the black stretch fabric. If you want to have a contrast, you can sew some of the different coloured fabric onto the front of the tee to give it balance.

Happy altering
Judith Turner