Wherever you add your hangtag, make sure you puncture it through a "seam" and not the actual shirt like the sleeve. Seems minor but over time that barely visible hole will spread. This is a method practiced in major retailers. I've worked in that industry for a while.
Try doing a google image search of some popular clothing labels and hangtags, you'll see alot of their methods of attachment. The clothes pin is something I've seen used on some high end fashion although the hangtag itself was really elaborate.
...by the way, the plastic 'fasteners' aren't a bad option either so as long as the hangtag is elaborate enough that the little plastic thing will go unnoticed. They sell these in different colors and lengths by the way and they often sell the fastener gun along with it
Try doing a google image search of some popular clothing labels and hangtags, you'll see alot of their methods of attachment. The clothes pin is something I've seen used on some high end fashion although the hangtag itself was really elaborate.
...by the way, the plastic 'fasteners' aren't a bad option either so as long as the hangtag is elaborate enough that the little plastic thing will go unnoticed. They sell these in different colors and lengths by the way and they often sell the fastener gun along with it