For visits to German cities, pack as you would for an American city: dressy outfits for formal restaurants and nightclubs, casual clothes elsewhere. Jeans are as popular in Germany as anywhere else, and are perfectly acceptable for sightseeing and informal dining. In the evening, men will probably feel more comfortable wearing a jacket in more expensive restaurants, although it's almost never required. Many German women wear stylish outfits to restaurants and the theater, especially in the larger cities.
Winters can be bitterly cold; summers are warm but with days that suddenly turn cool and rainy. In summer, take a warm jacket or heavy sweater if you are visiting the Bavarian Alps or the Black Forest, where the nights can be chilly even after hot days. In Berlin and on the Baltic, it is windy, which can be quite pleasant in summer but a complete bear in winter. To discourage purse snatchers and pickpockets, carry a handbag with long straps that you can sling across your body bandolier style and with a zippered compartment for money and other valuables.
For stays in budget hotels, pack your own soap. Many provide no soap at all or only a small bar.