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Unearthed Arcana: The Mystic Class contains the most recent version of the Mystic class (v3).

One of the psionic disciplines listed is Bestial Form; one of its psionic effects is Bestial Transformation, and one of the transformation options is called Tough Hide:

Bestial Transformation. As a bonus action, you alter your physical form to gain different characteristics. When you use this ability, you can choose one or more of the following effects. Each effect has its own psi point cost. Add them together to determine the total cost. This transformation lasts for 1 hour, until you die, or until you end it as a bonus action.

[...]

Tough Hide (2 psi). Your skin becomes as tough as leather; you gain a +2 bonus to AC.

Unearthed Arcana: Eberron also contains the Warforged race, which has the Composite Plating trait:

Composite Plating. Your construction incorporates wood and metal, granting you a +1 bonus to Armor Class.

For a warforged mystic, while the Tough Hide transformation is active, would its effects stack with the benefit of the racial Composite Plating trait? In other words, would I have a +3 to AC from those two things while transformed?

I can see arguments going both ways for this, so it is unclear to me.

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RAW, Yes. (Although with a huge caveat of both being playtest material from different sources^)

If you have multiple features that give you different ways to calculate your AC, you choose which one to use. (PHB p. 14)

Neither of these are a new way to calculate your AC. Bonus from different sources definitely stack unless they say otherwise according to Jeremy Crawford. These are both listed as bonuses. So you would calculate your base AC and add both bonuses.

Why it might not work

Both are reliant on the specific nature of the creature's physical build. One with wood/metal, the other changing your skin to leather. It wouldn't be a stretch to suggest that altering your physical form to a bestial form changes your current form (wood/metal) to leather, replacing the original +1 to AC. There is nothing mechanically that forces this and an extra +2 to AC is not outlandish considering the other options available to increase one's AC.


^ Note on all UA material. Generally combining sources is fraught with untested balance possibilities

This Is Playtest Material
The material here is presented for playtesting and to spark your imagination. These game mechanics are in draft form, usable in your campaign but not refined by design iterations or full game development and editing. They aren’t officially part of the game and aren’t permitted in D&D Adventurers League events.
If we decide to make this material official, it will be refined based on your feedback, and then it will appear in a D&D book.

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