If this is for the Country you would do well to forget the commie gun grabbing edicts & Obey the Constitution read it especially the 2nd Amendment Part.

BIG Flashlights...For nightime use...of course!

A hickory cane...

Pop 3 viagra.

Pepper Spray is fine especially if it's the regular capsicum type stuff, Stun Guns can be possessed outside of Federal buildings. As for knives if you're 3" or under you're fine, the problem with a blade over 3" is that a prosecutor can be easily claim that you had "unlawful intent". Check the link: https://mpdc.dc.gov/page/mace-pepper-spray-self-defense-sprays-and-stun-guns

The US Constitution is the supreme law of the land. It states that "the right of the people to keep and bear arms SHALL NOT BE INFRINGED". SCOTUS has also shown itself to not enforce/uphold the constitution when inconvenient to the onus is on YOU to defend your rights.

Tactical gloves with knuckle reinforcements. You don't want to get ANTIFA blood or spit in any wounds whatsoever. They're walking hepatitis c factories.

Do not ask for or accept legal advice on the internet. Ask a lawyer who is knowledgeable in D.C. law.

Most forms of protective gear are allowed but anything that is visible on your person which can be construed as or used as a weapon will best case, be confiscated or worst case, used as evidence against you in federal court.

Only FFL or active or retired LE can carry ANY firearms and D.C. does not allow any unconcealed carry by anyone.