In the early to mid 1300's, it was the style of german knights and some men at arms to use a sophisticated form of lanyard. Using fine chains that were a bit longer than arm length, these attached to the plate armor (or coat of plates) at the chest, and were attached to the shield, sword, and sometimes a dagger. They saw use for quite some time (50+ years), and allowed for the quick retrieval of a lost weapon in wet or bloody battle conditions.
The most surprising thing is that these chains did not get in the way much or foul ones weapons in combat.
Keep in mind they were wearing extensive armor, so damage was lessened from flying lost weapons.
Osprey Men at arms series has some good examples of this style in #166, Ge"rman Medieval Armies, 1300-1500"