I like your idea of crocheting a stripe, and I think it would look nice on a lot of different styles of shirts. I've also seen this lengthening trick using various types of fabric, especially for kids' clothes when they grow out of them--both on the front/back and the sleeves.
You could also make a lovely crocheted, knit, lace, or other detail for the bottom to lengthen the shirt, and maybe repeat the pattern somewhere else on the shirt to tie it together, such as a bit on the top of a pocket, on the sleeves, or at the tips of the collar. Or you could use a matching or contrasting fabric in place of cut-off sleeves for your previously successful lengthening/pocket trick.
If your shirt has a front and back yoke, it might be fun to replace the yoke with a different fabric, only longer than the original yoke.
Hope those ideas help!
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