if it's like the nee-Ruthenians, in the US, it can be by not scurrying fast enough when the priest looks your way!
I knocked on the sacristy door once to see if he needed help when I saw he only had one.
After that, if I didn't go in and vest on my own, he came out and brought me back . . .
currently, our parish is going without servers at all.
Hopefully we move outdoors again as the temperature drops; even with the distancing, it's not safe enough indoors--one of my daughters is at particularly high risk from *any* vascular problem due to having had a collapsed lung, so I need to be as cautious as if I were her, or she'll catch it from me before I know I have it . . .