Tops: Ender Glitch Hoodie - By ShapeStudio
Bottoms: RGB Boosted Pants - By Meraki
Outerwear: Ender Void Armor - By Diveblocks
Headwear: Shadow Crown - By SandBlock Studios
Gloves: RGB Pulse Gloves - By Senior Studios
Footwear: Hacker Shoes - By The Craft Stars
Face Items: RGB Glow Headphones - By Ambient Creations
Back Items: Hacker Aura - By RareLoot
Tops: RGB Flame Aura Hoodie - By Fall Studios
Bottoms: Bubble Trousers - By Dalibu Studios
Outerwear: Ice Armour - By Blockworks
Headwear: Quacky Clean Towel - By Minecraft
Gloves: Rainbow Flames - By Team Metallurgy
Footwear: Parrot Slippers ('17) - By Minecraft
Face Items: Shadow Mask - by ShapeStudio
Back Items: Blue Griffin Wings - By Owls Cubed
Once you understand the basic shape of the issue, it only takes about 20 minutes to put together unique sets that can reproduce the issue. Here's another reproducing set using completely different items that I just threw together now, buying items as necessary. And yes, I do expect a slow clap for that.
Tops: Warden Chest - By Unique Arts
Bottoms: Blue Vault Pants - By QwertyuiopThePie
Outerwear: Super Blue Aura - By King Cube
Headwear: Galaxy Head Aura - By Asiago Bagels
Gloves: Rainbow Fire Gloves - By OG Games
Footwear: Mythical Boots - By Minecraft
Face Items: RGB Face - By ShapeStudio
Back Items: Pink Butterfly Wings - By Syclone Studios
The goal is just to find the largest and loudest items to put all together at once. Perhaps it's some overload or overlapping issue, but regardless you can get a general feel for what will break it and what won't.
I'm just sitting here buying extremely noisy, bright items and layering them together in different combinations, and I've already been able to reproduce this multiple times with varying sets now.
Other slightly modified sets:
Tops: Lava Top - By MobBlocks
Bottoms: Void Pants - By Red Eagle Studios
Outerwear: Red Devil Suit - By Dalibu Studios (alternately Royal Flame - By 2-Tail Productions)
Headwear: Hello Kitty Lantern - By Minecraft
Gloves: Gloves of Ice - By Team VoidFeather
Footwear: Void Flames - By Netherpixel
Back Items: Dark Void - By TNTgames
And here, to provide a completely distinct set of items from my original list:
Tops: Lava Top - By MobBlocks
Bottoms: Void Pants - By Red Eagle Studios
Outerwear: Red Cloak Armor - By Team Vaeron
Headwear: Hello Kitty Lantern - By Minecraft
Gloves: RGB Pulse Gloves - By Senior Studios
Footwear: Void Flames - By Netherpixel
Back Items: Dark Void - By TNTgames
I'm sitting here buying cosmetics now, just to reproduce this for you...
Here's another reproducible set (partially built from previous reports):
Tops: Lava Top - By MobBlocks
Bottoms: Void Pants - By Red Eagle Studios
Outerwear: Tainted Void - By Waypoint Studios
Headwear: Pulsating Void - By Pixelbiester
Gloves: Void Hands - By SandBlock Studios
Back Items: Dark Void - By TNTgames
But I see no actual resolution anywhere, and this is extremely reproducible.
Several exact sets of items that reproduce this can be found in (presumably duplicated) issue: MCPE-190349.
I can also provide video if necessary.
Likely a duplicate of MCPE-179613 and related issues.
Tops: Flame Samurai Chest - By Spark Universe
Bottoms: Ice Pants - By Glorious Studios
Outerwear: Chromatic Glow Suit - By Dalibu Studios
Headwear: Hollow Lich Punk - By Scai Quest
Gloves: Chroma Enigma Gloves - By Pixelationz Studios
Footwear: Ice Boots - By Chillcraft
Face Items: RGB Headphones Face - By Kubo Studios
Back Items: Ice Dragon Wings - By Dots Aglow