I wear a sleeveless, so yesterday I tried to keep it out of the way by feeding it into my sleeve at the shoulder and snaking it down down my chest just inside the sleeve opening as illustrated in figure "A"
This was a mistake. I didn't feel anything while swimming, but when I took my wetsuit off, I discovered that the strap had created quite an abrasion (see figure "B"). And as luck would have it, this is EXACTLY where my bike bibs sit on my shoulders and it hurt (bad) pretty much through an entire ride today.
Avoid this at all costs.