[[quoteright:350:[[Film/TheBoondockSaints http://static.tvtropes.org/pmwiki/pub/images/Trenchcoat_Warfare_Boondock_Saints_5049.png]]]]
[[caption-width-right:350:''There was a '''FIREFIGHT!''''']]
Someone allows his or her BadassLongcoat to flare open, revealing enough weaponry to outfit a small separatist uprising with enough to spare for opening a gun shop.

Compare with HyperspaceArsenal and CoatFullOfContraband. Often overlaps with ThrowAwayGuns. Will likely precede an OhCrap moment. Surprisingly little overlap with the TrenchcoatBrigade.
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!!Examples:

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[[folder: Anime and Manga ]]

* Pierrot Le Fou from ''Anime/CowboyBebop''.
* Meryl Strife from ''{{Trigun}}'' did this to an extreme, with dozens of one-shot derringer pistols lining her cloak, which she'd [[ThrowAwayGuns go through quite rapidly in a gunfight]].
* Variant in ''Anime/TheCastleOfCagliostro'': Lupin, shortly after ripping off the false beard, mustache, and glasses from his disguise as the archbishop, is about to be rushed by the Count. He then dramatically throws open the robe to reveal dozens of lit fireworks, all of which launch and begin going off, causing chaos and confusion. Jigen and Goemon (used to Lupin's talents for causing mayhem) take advantage of it to go on the attack, Jigen opening fire on the Count's assassins with a World War II anti-tank rifle and Goemon cutting their armor open with his super-sharp sword. Zenigata [[StormingTheCastle storms the castle]] with several Interpol troopers and they get into a fight with the royal guard.
* Sayaka from ''Anime/PuellaMagiMadokaMagica'' does this with her cape to create swords, which she then [[ThrowingYourSwordAlwaysWorks throws]]. Mami does this with her MagicSkirt [[PantyShot (no, it doesn't look like how you think it goes)]].
* In ''Anime/ReadOrDie'', Yomiko Readman's coat is filled with newspapers, magazines, paperbacks, and other forms of reading material. While most of the time this is due to her being an obsessive bibliomaniac, her powers as a PaperMaster allow her to wreak a lot of havoc with all that reading material if she has to.
* In one episode of ''Anime/{{Pokemon}}'', a doctor opens his lab coat to reveal an arsenal of scalpels, syringes, and other instruments of medical pain as he tells Team Rocket exactly why it would be unwise for them to try to steal the Pokemon that have been temporarily been placed under his care.
* Ryouma in ''New GetterRobo'' opens a cloak halfway through the series, revealing an arsenal of pointy and sharp objects on his person.
* In LightNovel/{{Slayers}} TRY, Jillas, a comic relief AntiVillain and a parody of TheGunslinger, demonstrates this trope with a cloak.
* Zazie from Battle Angel Alita: Last Order goes as far as to have an extra pair of arms under coat, holding even more guns.
* In an episode of Anime/{{FLCL}}, the villain-of-the-day is a giant gunslinger in a poncho, out from which it produces several different firearms; when flipped upside-down it [[spoiler:is revealed to be a giant hand, each finger holding a gun.]]

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[[folder: Comic Books ]]

* ThePunisher has done this upon occasion.
* In the ''[[{{TheAuthority}} Jenny Sparks: Secret History of the Authority]]'' miniseries, Midnighter opens his coat to reveal nearly a dozen [[ImprovisedWeapon sharp objects]]. When he joined the Authority, he upgraded to a [[HyperspaceArsenal tesseract coat]] that holds any number of weapons imaginable and weighs close to 70 kilograms.

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[[folder: Film ]]

* The most famous example of this is Neo in the first ''Film/TheMatrix'' movie.
-->''(Neo steps through a metal detector, setting it off.)''\\
'''Security Officer''': Could you please remove any metallic items you may be carrying: keys, loose change...\\
''(Neo opens up his coat, revealing a massive weapons stockpile.)''\\
'''Security Officer''': [[OhCrap Holy shit.]]
* ''Film/TheBoondockSaints'' features Il Duce, who reveals six pistols under his coat just before the firefight with the title characters.
* The titular character in ''Film/VForVendetta'' at one point draws back his cape to reveal multiple knives. He goes on to subvert NeverBringAKnifeToAGunFight.
* ''Film/{{Machete}}'' carries a ludicrous number of knives in his trenchcoat.
* ''TheTransporter 2'' manages to combine this with blatant {{Fanservice}} when [[TheDragon Lola]] first tries to kill the protagonist, ripping open the [[MuggedForDisguise white labcoat she's wearing]] to reveal a pink bra and panties, black garter, suspenders and stockings, and twin laser-sighted full-auto Glock pistols which she puts to immediate use.
* Used for AnachronismStew effect in the opening scene of ''Timecop'' (1994), in which criminals are using time travel for personal gain. A lone man confronts five AmericanCivilWar soldiers in the pouring rain, and insists they hand over the gold in the wagon they're escorting. They reach for their guns, only for the man to whip open his coat and gun them down with laser-sighted GunsAkimbo machine pistols.

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[[folder: Literature ]]

* In ''Literature/TerminalWorld'', ActionGirl Meroka's introductory scene has her open her coat to reveal a sub-machine gun, a revolver, an automatic, a blunderbuss, a crossbow, and a varied assortment of knives.

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[[folder: Video Games ]]

* The Merchant's introduction in ''VideoGame/ResidentEvil4'' - he can carry as much stuff within his coat as he can sell to Leon, and it shows.
* In ''EpicBattleFantasy 3'', the Gunslinger enemies and their sword-based variant essentially ARE trench coats with robotic heads. The coats don't open, although just because it'd require an explanation on how hammerspace works - {{BFG}}s or {{BFS}}s still emerge from the coats regularly.

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[[folder: Web Comics ]]

* In a variation: EvilChancellor Magon during the 'Stormbringer' arc of ''Webcomic/SluggyFreelance''. Seeing as it's the middle ages, he doesn't have any guns or trenchcoats - he does, however, have several daggers lining the inside of his cloak. All the easier to to indulge in his ChronicBackstabbingDisorder. (Though he prefers the term 'Morally Challenged'.)
** And in another case, one character accuses Riff of bad intentions towards another character by asking if he had A weapon beneath his trench coat. Kiki the ferret jumps out from the coat replying that it wasn't just one gun, it was an arsenal.
* HeartCore: [[http://www.deviantart.com/art/heartcore-chp-08-page-288-301525807 Seems that]] [[MadBomber Carval]] was more than prepared to bring a shirt full of blood bombs with him for his fight against Ame.

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[[folder: Web Original ]]

* Sniper, from the ''GlobalGuardiansPBEMUniverse''.
* Parodied [[http://www.youtube.com/watch?v=9VDvgL58h_Y this]] fake movie trailer, albeit with a hoodie instead of a trench coat, and... spoons instead of guns.

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[[folder: Western Animation ]]

* Variant in the animated show ''WesternAnimation/{{COPS}}''. The villainous Buttons [=McBoomBoom=] opens his coat to reveal machine guns hidden ''inside his chest.''
* Along with his equally-sized arsenal in his hat, this is WesternAnimation/SecretSquirrel's schtick. He has a device for pretty much any situation but has problems either getting it out in time or finding it among other gadgets. His storage of objects inside his trench coat comes up as the focus of an episode of ''WesternAnimation/HarveyBirdmanAttorneyAtLaw'' when Secret gets mistakenly accused of flashing people and turns to Harvey for legal backup.

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[[folder: Real Life ]]

* Ever wondered why the trenchcoat is called a ''trench''coat? Because they were [[http://en.wikipedia.org/wiki/Trench_coat first produced for British officers]] in WorldWarOne. These greatcoats were, in fact, tailored exactly for this trope's sake (other than keeping the wearer warm and dry in the trenches). You could stuff the pockets and fit the belt with hand grenades, maps and casings, ammo cartridges, swords, walking sticks, and much more. Plus, the coat made it easier to shoulder rifles and similar things.

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