ah my table banned this item because someone had it with a 21 ac and the shield spell

How much would this cost

It's a rare item so its worth 5 000 GP

My DM got so pissed at my AC 25 Rouge/Warlock with this item AND could cast Shield, that after level 16, almost every enemy we fought conveniently had Truesight. I love this item.

does it attune to anything specific

We got ours cheap after a nasty scrap with displacer beasts.. Got the skins and a very friendly artificer. Probably your best bet at lower levels... My Swords Bard loves hers.... !

Does rogue's Aim ability negate the cloak's effect? Because aiming sets your speed to 0, but does it count as being "unable to move" as far as this effect is concerned?

I'd say it still works as the cloak makes an illusion that you're somewhere else 

So, could I use this while trying to pick pocket someone?

A lot of people saying this makes an illusion near you and makes the actual you invisible... I've never read it like that... I've always read it to mean it projects and ADDITIONAL image of you next to you. The disadvantage is because they don't know which image is you. And no, "but it's in your space" is not an argument that it overlaps. 25 square feet is a pretty big area. Draw a 5ft x 5ft square on the ground and tell me you can't fit an illusion of yourself in there with you.

would this give disadvantage on stealth checks, or make you roll intelligence as well because you'd need to make sure both you and your illusion were both hidden, or am I thinking too hard

Quote from NameinProgress >>

 So can I use this like as if I have a shadow clone friend always with me or is that not what's going on here?

 If your DM says yes you can re-flavor it like that but normally it looks like you're standing right next to where you're actually standing

it essentially would blur you and make it seem like you were standing right next to where you are. like when someone gets a concussion and is seeing double.

Quote from SamuraiHoss >>

As a player who doesn’t access the DMG or information my character(s) wouldn’t have (yes I guess I’m a rules nerd that way), I’m interested in what kind of effect this cloak would give to a rogue’s sneak attack ability. My thinking is that since the target might be looking for an attack from point a, an attack originating from point b would be a surprise. Example: a rogue with a COD appears to be standing at 11 o’clock to a target. When the target receives a dagger strike into their right ribs from 1 o’clock instead of their left ribs from 11 o’clock, would that count as a sneak attack? 

 it doesn't say it would give a sneak attack bonus or anything in the official rules but the rules themselves say the DM can change them as they please and as a DM I think this is a great idea.

Quote from squaggol >>

ah my table banned this item because someone had it with a 21 ac and the shield spell

 Lol i was going to ask my DM for it while i'm playing my 1lvl Hexblade 5 lvl Paladin who has 20 AC and Shield Spell, I doubt he'll go for it

Quote from Thewishingspell >>

would this give disadvantage on stealth checks, or make you roll intelligence as well because you'd need to make sure both you and your illusion were both hidden, or am I thinking too hard

 

 RAW it does nothing to affect stealth. If you and your DM wish to change that, as always with this game, you are perfectly capable of doing so, but in DnD, unless specifically stated, spells, items, and abilities function exactly as written. Nothing more and nothing less.

For those who adhere to strict RAW interpretations, note that the description says "makes you appear to be STANDING in a place near your actual location."

Strict RAW, then, means if you're wearing the Cloak while flying, your illusory self is STANDING on the ground, not flying.

That's as poor an interpretation as saying a Grapple wouldn't have Disadvantage because, despite using an Attack action, it's an opposed skill check.

Quote from That_Poptart >>

Quote from kelfion >>

Quote from CoryHunt >>

Quote from Cortower >>

“When you want to grab a creature or wrestle with it, you can use the Attack action to make a special melee attack, a grapple.” -PHB

Grapples are just a melee attack that use Strength (Athletics) instead of weapon proficiencies, so they are affected by this item.

https://www.dndbeyond.com/sources/phb/combat#MakinganAttack

 
Actually, in the next paragraph it says (bold emphasis mine):
"Using at least one free hand, you try to seize the target by making a grapple check instead of an attack roll: a Strength (Athletics) check contested by the target's Strength (Athletics) or Dexterity (Acrobatics) check (the target chooses the ability to use). You succeed automatically if the target is incapacitated."

In the cloaks' description, it says (again, bold emphasis mine):
"While you wear this cloak, it projects an illusion that makes you appear to be standing in a place near your actual location, causing any creature to have disadvantage on attack rolls against you. "

So no, this wouldn't protect against grapples.

 It would.It states it is an attack ,but instead of using To hit you use your STR(athletics) check ,but it is still saying it is an attack. That is like saying attempting a grapple gives you true sight and wouldn't get disadvantage in darkness as its not an attack roll.  Also it says a Dm can give Advantage and disadvantage where appropriate. Thus it would be appropriate to say when they first try they have disadvantage. 

 That interpretation is incorrect. A grapple attack is explicitly a contested ability check, not an attack roll. It is explicitly NOT an attack roll. Therefore, this cloak would RAW not affect a grapple. Of course, the DM can rule any which way and override the written rules, but claiming that such a ruling is based on what the rules say is incorrect.

 Yeah, it's quite true that the DM can really do anything they want, but in this case scenario, saying this as a DM, I would say that a grapple would be made with disadvantage.  Because in combat, any action against another player or being counts as an attack as your overall goal is to harm the creature.  Also, in the description, it says that "it projects an illusion that makes you appear to be standing in a place near your actual location" so for realism, since there is an image of you standing "near your actual location," this means that they would attempt to attack the image of you not you, impeding a disadvantage.  This is because if you actually had this cloak and a person tried to grab you, they would most likely try to grab the image, again, giving a disadvantage, because the chance of actually grabbing you and not empty air is quite low.  

Weapon Mastery-graze is going to be trouble for anyone wearing this. It stops working on damage, so if an enemy has access to Graze, where on a miss you damage your ability mod anyway, then the it will turn off even if they miss.

You’d be at a disadvantage but if they were able to attack you then you would be grappled.