Many stores in vienna: https://www.trachtenmaedl.at/ https://www.landhauswien.at/ https://www.originalsalzburger.at/standorte/ We are planning to go to one or 2 of them a few days before the wedding - feel free to join us.
Euros - We recommend having some cash in local currency on hand. Unlike in the US, you can't buy everything with credit card.
As of 5/16, Austria dropped all entry restrictions - YAY! In Austria, life is pretty much back to normal. Masks are still required in public transport (train, bus, subway etc.)