Unfortunately, the trimmed armor command does not work in Minecraft Bedrock Edition, as it lacks support for NBT tags. If you want trimmed armor in Bedrock Edition without exploring, you can ...

Minecraft: Bedrock Edition add-ons — Gameplay and ... over 29 new hammers to mine them with, and over 23 new armor sets and tools to craft using the new ores. In addition, this add-on also ...