Shorts, mini-skirts, sandals, flip-flops etc.are perfectly OK and worn by many locals in Krakow in summer - obviously only on hot days and not in formal occasions. PS. If you plan to visit churches, it is a good idea to dress more conservatively.
People Also Ask
The average tip is around 10-15% of the cheque. Tipping is not obligatory, you can tip whoever you want to show that the service was good. Don't forget to tip tour guides and drivers too, but only if you are happy with the service they have provided.
In urban areas such as Warsaw and Krakow, which are used to serving tourists, tipping at restaurants is almost expected. Tip approximately 10% for good service and 15% for phenomenal service.