Some assistance, might be over come by newer statutes, is provided here:
-1.
http://deloc.org/forums/ [wading thru some posts common theme was firearm must be visible on three sides...waistband carried is not considered OC ?]
1. 2014
https://forum.opencarry.org/index.php?threads/out-of-state-visiting-delaware.122277/
OC in DE is not an issue. However OC in City of Dover requires written permission from the chief of police. So at least in the city of Dover conceal with your permit otherwise enjoy DE's open carry laws. There are restricted areas like court houses, police stations,state parks, federal buildings. Just read up on restrictions. Signs are not enforceable here but if you are asked to leave and refuse to you can be charged with misdemeanor trespassing, or something like that.
2. Handgunlaw.us, quote
Open Carry is legal in Delaware but from all I can find out not a common practice. Places as listed in the “Places Off Limits” above apply to those who open carry. See the “RV/Car Carry Without a Permit” section for carrying in a vehicle. Delaware has preemption but some Cities and Counties that had Laws/Ordinances concerning the carrying of firearms were grandfathered when preemption was passed. It is up to you to know the local Laws/Ordinances. The Minimum age for Open Carry is 18.
3. 2013
https://forum.opencarry.org/index.php?threads/delaware-open-carry-law.103635/