How do I make a function keep working even after a player has died?

Please note that I am making assumptions on the conditions and meanings of things inside of your code for you have only provided, as said, a section of the problematic code. I am assuming playerQuery[i] is a table containing Player Instances, i being the player that the admin is currently focusing on with the command.

** I have changed the tabbing of your code that you'll need to correct when inserting it into the main script, this is so I could have edited faster and read it easier to help **

Look bellow for the hopefully fixed segment of code, I have comments explaining certain things.

if playerQuery[i].Character and playerQuery[i].Character:FindFirstChild("Torso") and playerQuery[i].Character:FindFirstChild("Humanoid") then
    function uniform()
        playerQuery[i].Character.Shirt:Destroy()
        playerQuery[i].Character.Pants:Destroy()
        local shirt = Instance.new("Shirt", playerQuery[i].Character)
        local pants = Instance.new("Pants", playerQuery[i].Character)
        shirt.ShirtTemplate = "http://www.roblox.com/asset/?id=281088169"
        pants.PantsTemplate = "http://www.roblox.com/asset/?id=281088561"
    end



    if (playerQuery[i].Character:findFirstChild("Humanoid")) then

        uniform() -- Put the uniform on the character first

        local Added = game.Workspace.ChildAdded:connect(function(Char) -- Fires every player respawn, the Char gets added again after death
            if Char.Name == playerQuery[i].Name then -- Make sure it is the correct person; assuming this works
                uniform()
            end
        end)
    end
end

You'll notice that I made the event ChildAdded become a Variable. You can use this variable, if you change the scope, to disconnect the event if you want a command to stop giving uniform on respawn. This would be done by Added:disconnect().

• Why didn't you script work?

Assuming the table works the way you want it, you're firing the Died event then giving their uniform. So the second they die, they get a uniform BEFORE they respawn, causing their new body to not be updated with the uniform.

Comment any questions, accept this answer if it helped!

For this script, you should use the .CharacterAdded() function, here is an example: Without the command

game.Players.PlayerAdded:connect(function(p)
p.CharacterAdded:connect(function(char)--char is the players character
            char.Shirt:Destroy()
           char.Pants:Destroy()
            local shirt = Instance.new("Shirt", char)
            local pants = Instance.new("Pants", char)
            shirt.ShirtTemplate = "http://www.roblox.com/asset/?id=281088169"
            pants.PantsTemplate = "http://www.roblox.com/asset/?id=281088561"
end)
end)

Here is the script for a .Chatted command:

local change = false
game.Players.PlayerAdded:connect(function(p)
p.CharacterAdded:connect(function(char)--char is the players character
    if change then
            char.Shirt:Destroy()
           char.Pants:Destroy()
            local shirt = Instance.new("Shirt", char)
            local pants = Instance.new("Pants", char)
            shirt.ShirtTemplate = "http://www.roblox.com/asset/?id=281088169"
            pants.PantsTemplate = "http://www.roblox.com/asset/?id=281088561"
end
end)
end)

game.Players.PlayerAdded:connect(function(p)
p.Chatted:connect(function(msg)
if msg == "cmd" then
change = true
end
end)

Here is the script for only admins:

local admins = {}--Add admins
local change = false
game.Players.PlayerAdded:connect(function(p)
p.CharacterAdded:connect(function(char)--char is the players character
    if change then
            char.Shirt:Destroy()
           char.Pants:Destroy()
            local shirt = Instance.new("Shirt", char)
            local pants = Instance.new("Pants", char)
            shirt.ShirtTemplate = "http://www.roblox.com/asset/?id=281088169"
            pants.PantsTemplate = "http://www.roblox.com/asset/?id=281088561"
end
end)
end)

game.Players.PlayerAdded:connect(function(p)
p.Chatted:connect(function(msg)
if msg == "cmd" and admins[p.Name] then
change = true
end
end)

If this helps, accept the answer, it gives us both rep

Also, .CharacterAdded only gets fired when a character gets spawned in, eg after :LoadCharacter() is fired and if the humanoid is killed.