When you pack your clothes, there are a few things to keep in mind. First, Germans tend to dress slightly more formally than Americans-- so bring clothes that look more put together, as opposed to sweatpants, ripped jeans, belly shirts, athletic wear, etc.  You will not see many Germans wear shorts unless it's very hot out.  Second, Germans wear slippers inside the home, so you may want to bring your own pair (flip-flops are also fine for the summer).

In addition to your clothes and toiletries, here are a few important items to pack:

Electronics: EU/German adaptor with USB port; phone and computer chargers; unlocked cell phone

Important Documents:  Map and details of your destination; copies of passport, visa documents, etc.

Medicine:  Prescriptions (talk with your doctor about exact amounts); Advil or Ibuprofen

Incidentals:  Reusable shopping bags; reusable water bottle; spices or package mixes from home