Can a character wear both Chain mail and Leather to get a higher AC and to fool an enemy?

Background:
I am reading the anime book "Goblin Slayer", the light novel not the comic.

In it the main character wears leather armor over plate or chain to both stack his AC and to confuse his (not very intelligent) enemies into hitting where leather is vulnerable but plate or chain is not.

Question:
In dnd 5th edition, can one wear multiple types of armor and get an AC stack? Can it confuse weak foes like goblins?

Notes:
Here are answers that don’t speak to this question:

  • Can a chain shirt be concealed under normal clothing? (this is about concealed, I’m asking about stacked)
  • Stacking multiple types of armor (this is not dnd 5e centric)
  • Can you wear a Mithral Chain over Snakeskin Tunic and have their effect stack? (this is pathfinder)

Please, if you are going to down-vote, say why in the comments. If I don’t know what I did wrong, it is literally impossible for me to willfully act better and change that thing. It might happen by accident, but the universe doesn’t like happy accidents.

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What restrictions are there on the appearance of glamoured studded leather armor?

I was wondering about the glamoured aspect of glamoured studded leather armor. The description states that:

You can also use a bonus action to speak the armor’s command word and cause the armor to assume the appearance of a normal set of clothing or some other kind of armor. You decide what it looks like, including color, style, and accessories, but the armor retains its normal bulk and weight. The illusory appearance lasts until you use this property again or remove the armor.

What are the restrictions on the appearance it can take? For instance, can I make it look like full plate armor, helmet and everything? I know leather armor can include a leather cap, but a leather cap does not cover the face like a full helmet does in most cases.

Can my warlock benefit both from mage armor and leather armor?

Currently making a 5E Warlock for an upcoming session, and I’m wondering how this particular interaction works:

I, as a Warlock, start with leather armor. I’m considering having Armor of Shadows as one of my two Invocations, for at-will self-Mage Armor (DM is starting us off at 3rd level). However, the description of Mage Armor stipulates that “You touch a willing creature who isn’t wearing armor, and a protective magical force surrounds it until the spell ends.”, and also that the spell ends if the target dons armor or the spell is dismissed.

So I’m wondering: If I wear leather armor (since I get it starting as a Warlock), can I still use the at-will Mage Armor to have a 13+Dex modifier AC instead of leather armor’s 11+Dex modifier AC?

Can you ‘upgrade’ leather armor to studded armor without purchasing the new armor directly?

I’ve been combing through the things in my Player’s Handbook that I normally gloss over and realized that there’s not much distinction between Studded leather armor and Leather armor. The 5e manual states

Studded Leather Armor Made from tough but flexible leather, studded leather is reinforced with close-set rivets or spikes. Weight-13 lbs

and

Leather Armor The Breastplate and shoulder protectors of this armor are made of leather that has been stiffened by being boiled in oil. The rest of the armor is made of softer and more flexible materials. Weight -10 lbs

So to my understanding, either Leather armor’s boiling in oil is something that Studded leather armor doesn’t have, or the only difference between the two is about 3lbs of rivets/spikes.

Comparing the price per weight to things like ball bearings, or 5lbs of iron spikes, the rivets/spikes used in the armor should come out to about 1gp.

So if you had a party member who was proficient in leatherworking and was willing to donate their time, could you transform a 10gp Leather Armor into a 45gp Studded Leather Armor for a meer 1gp?

Is there any difference between Studded Leather and Breastplate if my AC is the same with both?

Playing 5e with a Rogue. To make a long story short: In my possession I have both Studded Leather armor and a Breastplate. With my 18 Dexterity, My AC with Studded Leather is 16 (12+4). But if I don the Breastplate, my AC is the same: 16 (14+2). Since neither have any disadvantage on stealth or DEX throws – what confuses me is what the difference is. My character has the money to pay for training and doesn’t need cash to the point where I need to hawk the Breastplate for coin. Nobody in the party needs it, and so the question remains:

Is there really a difference between them at this point?

Is the choice cosmetic now? Between a Rogue wearing spiked leather padding all over – or a dense plate with free-flowing arms and legs otherwise? It can’t be this simple, there has to be another angle to it that I’m unaware of. There’s no reason for a piece of medium armor and Light armor to be statistically identical.

Is one truly wiser a choice than the other? If I swap out my Studded Leather for a shiny new Breastplate, is there anything else for me to worry about other than another 7lbs on my person?

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