- Reach into your collar and pull it up with just your thumb?
- Reach into your collar and pull it up with your whole hand (grab it with your fingers)
- Pull it up from the outside of your shirt with your thumb and pointer finger?
- Swing your shoulder up with your arm kinda above your head to shove the strap back up onto your shoulder? (Sorry hard to describe)
- Leave it down
-Other? (Describe in comment)