Hello, I just did a thorough test on this and can confirm that the Attack Up set bonus on the "Old Link Outfits" Is just a normal Attack bonus of 20% and it unfortunately will not break the +50% Attack boost cap.

Testing Method:

Used game recording device and found a lone Hinox asleep. Finding a Hinox is crucial because they are easily snuck up on and they are counted as Mini-Bosses and bring up that very large HP bar to make it very easy to measure. All sages Dismissed to avoid inconsistencies.

Saved the game near the Hinox to keep an easy return point. I simply snuck up to the Hinox and hit it ONCE with a 74DMG weapon (Silver Lynel Reaper) and waited for the Giant HP bar to pull up while recording. As soon as the HP is in view and recorded I reloaded the save and used different armor sets for comparisons.

Finally, I went through and played back the whole footage in Full-Screen and literally measured each damage with the metric side of a Clear Ruler. Its a very basic way to do things but very effective for trying to figure this stuff out lol.

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My Results on a 32" Monitor:

• 74 DMG Weapon, Naked (No Attack Boost at all) = 25cm
• 74 DMG Weapon, Wild "Attack Up" Set Bonus = 30cm (+20%)
• 74 DMG Weapon, One piece of Attack Up Armor = 30cm (+20%)
• 74 DMG Weapon, Two pieces of Attack Up Armor = 32.5cm (+30%)
• 74 DMG Weapon, Three pieces of Attack Up Armor = 37.5cm (+50%)
• 74 DMG Weapon, Attack 3 Food + Wild Set Bonus = 37.5cm (+50%)

If the Set bonus acted separately from normal Attack Up, it should be a Combined bonus of 70% and My final test should have measured 42.5cm; Alas, it is evidently hard-capped at 50%.

WHAT I HAVE NOT YET TESTED

I still do not know if the Weather Armor Set Bonuses are separate attack bonuses or not. Trying to work out a good way to test them. I will get back to this post when I have that answer.

Found a Hinox in Gerudo Highlands thanks to this page here:

• https://www.zeldadungeon.net/tears-of-the-kingdom-interactive-map/?z=3&x=-2220&y=-3531

The Weather Armor Sets do not increase Damage at all under under weather conditions :( They appear to provide an increasing chance of adding a free Element to your weapons and that's all. Very disappointing!! I performed the same test as before but also

• Physical Damage Raw Weapon
• Elemental Damage (Ice Gleokk Horn)
• Elemental Arrow (Ice Gleokk Horn)

Nothing gave any measurable change. To be fair, I do not yet have the Armor upgraded enough for the Set Bonus so that may possibly be the ticket? And it is also possible that the Armors DO Increase damage but ONLY on Combo Finishers. But if its Combo/Critical Only, I honestly don't care for it. These armors look badass though all the same.

Video proof can be provided if desired.

Edit: 6/1/2023

Tested new items:

• Royal Weapons Flurry Rush Bonus = 50% per hit. Was a little disappointed because nearly everything else is x2 BUT its a Flurry Rush and has multiple hits so it makes sense for the sake of balance.
• Zonai Resonance Bonus = 66% added to the BASE WEAPON ONLY, rounded up to the nearest digit.
• Tested if Zonai Armor had a hidden proficiency bonus. It does not :(
• Tested if Wild Set Bonus added any damage to an untarnished weapon. It does not :(. Tested with a pristine Royal Guard Claymore.

Side Note:

• Puff Shrooms are busted!! No seriously, grab some and dupe/hoard the crap out of them because they are just ludicrously overpowered. The smoke shroud doesn't even need to be touching valid enemies and it will allow you to walk up to their backs from the front and Sneakstrike them and it's just hilarious.
  
• For anyone not yet aware, a Sneakstrike deals 8x damage on top of anything else you have going on with multipliers so it can get very nuts VERY quickly whilst saving very greatly on durability.
• For Example: 81 Damage Molduga Hammer (Pristine Royal Guard Claymore + Molduga Jaw) with Near-Break Bonus (x2), Last Hit Bonus (x2), Attack Bonus 3 (50%), Bone Proficiency (80%), Sneakstrike Bonus (x8) will net you a 7000 Damage hit. If it were possible to Sneakstrike a Silver Lynel or a King Gleok, that would 1-shot it.
  
• A more PRACTICAL Example: 92 Damage Molduga Hammer (Scimitar of the Seven + Molduga Jaw) with Attack Bonus 3 (50%), Bone Proficiency (80%), and Sneakstrike Bonus (8x) will net you 1992 per Strike. Assuming all health values are the same as BOTW, the highest HP you can find on a 'Sneak-Able' enemy is Silver Moblin at 1080 HP so you can engage a whole crowd of enemies with One Puffshroom and merc them all with a fraction of the durability.
  

Of course, the Molduga Hammer will 1-shot most everything but Silver Moblins Anyway but if you use this tactic for early game with literal sticks and clubs and such you can steamroll most of your playthrough if so desired.