Any flag with 3 stripes and a ratio of 3 to 2 would do, just choose the right colours. If you can't find one send me a PM. Do you really want 22 cm? That's huge. I just measured my husband's shirt pocket and that is 12 cm wide. 22 mm would be tiny.
I have sent you a PM. It needs to be tiny as I put designs right in the corner of the top of the pocket
This may be too big, but you may be able to adjust it to the size you want.
https://www.embroiderydesigns.com...
Thank you Jerrilyn but I need it much smaller and I do not think I can do that with my limited software. Thank you for helping.