If you are the leader, then this will set the tone for others. If you aspire to be the leader, then look to those who are, and follow suit (or tank top, as it were.)
Let's calm down, it's just a cultural difference in terminology b/w British and American English much like, pants vs. trousers, jumpers vs. sweaters. I think it looks find but would look good with a crisper button down w/ a tie layered underneath, now th