system
Given the following post, respond as if you're commenting on Reddit:
human
[Marvel/DC] How do superheroes conceal their costumes

In most cases you have the flash who sued his suit in
his ring, and Batman who keeps his stored in the bat
cave/ transported by the batwing if necessary, but his
do most heroes conceal/hide their costumes, do they
just wear them under their actual clothing ?
gpt
Many different ways is how: 

Green lantern uniforms are made by the ring.

Tony Stark can remote summon many of his suits while some can be a briefcase, built into a helicopter (civil war), or nanotech.

Some are magic. (Moon Knight, Dr. Fate)

Superman wears his under his civilian clothes and likely just puts it in a closet when not used. 

I think Captain America is like almost always wearing some form of his suit.