To console those who mourn in Zion, To give them beauty for ashes, The oil of joy for mourning, The garment of praise for the spirit of heaviness; That they may be called trees of righteousness, The planting of the LORD, that He may be glorified.”Isaiah 61:3 (NKJV)
We put on firm, comfortable, warm, clothes that cover us, protect us from the elements like heat and cold; they are immediate protective gear against hurts, wounds, and infections; then they make us look smart, wonderful, lovely and inspiring.
Likewise, spiritually, praise is firm, strong, comfortable, protective clothes or a garment we put on that covers us, keeps us warm (full of life, hope, faith, joy), protects us from the elements of fear, worry, discouragement, confusion, panic, depression, bitterness. The etymology or the root history of the word garment has the meaning of defence, equip, arm, and decorate. So, garments or clothes are for defense, equip, arm (as in weaponise) and decorate (add honor to, beautify).
Praise is a defense against fear, worry, discouragement, confusion, doubt. In Acts 16 Paul and Silas were seized, beaten and put into prison for preaching the Gospel and demonstrating its power. At midnight while they were praising God the prison was shook by an earthquake, the prison doors flung open and the chains broke off their hands and feet. As we praise God, as we speak or sing of his love, goodness, Grace, mercy, faithfulness we are putting on a defense, getting equipped, being armed or weaponised against all evil. We are being decorated or honored and beautified.