If thats your argument, i will hand you a skull cap, and you can safely use the sweaty helmet of the previous pilot then.....
I agree its no issue when you wear an emersion suit....but with only a coverall, wearing a sweaty vest should be a no-go.....
In an environment where a company charges 3000-5000 usd per flight hour they should be able to afford 2-3 more life jackets for the crew-and they are not that expensive, just hand out a jacket, and transfer the beacons from one pilot to the other....
We can continue to find more pros and cons...but basic line should be that there should be enough equipment..there must be spare jackets anyway-to replace one that accidentally got activated, for example..why not use them?