How do i make certain people in game spawn with a cape?

Look into the code for the admin command you're referring to, and make it connect to the PlayerAdded event of the Players service.

if msg:lower():sub(1,5) == "cape " then
local chk1 = msg:lower():sub(6):find(" ")
local plrz = GetPlr(plr, msg:lower():sub(6))
local str = "torso.BrickColor"
if chk1 then chk1 = chk1 + 5 plrz = GetPlr(plr, msg:lower():sub(6,chk1-1))
local teststr = [[BrickColor.new("]]..msg:sub(chk1+1,chk1+1):upper()..msg:sub(chk1+2):lower()..[[")]]
if msg:sub(chk1+1):lower() == "new yeller" then teststr = [[BrickColor.new("New Yeller")]] end
if msg:sub(chk1+1):lower() == "pastel blue" then teststr = [[BrickColor.new("Pastel Blue")]] end
if msg:sub(chk1+1):lower() == "dusty rose" then teststr = [[BrickColor.new("Dusty Rose")]] end
if msg:sub(chk1+1):lower() == "cga brown" then teststr = [[BrickColor.new("CGA brown")]] end
if msg:sub(chk1+1):lower() == "random" then teststr = [[BrickColor.random()]] end
if msg:sub(chk1+1):lower() == "shiny" then teststr = [[BrickColor.new("Institutional white") p.Reflectance = 1]] end
if msg:sub(chk1+1):lower() == "gold" then teststr = [[BrickColor.new("Bright yellow") p.Reflectance = .4]] end
if msg:sub(chk1+1):lower() == "kohl" then teststr = [[BrickColor.new("Really black") local dec = Instance.new("Decal", p) dec.Face = 2 dec.Texture = "http://www.roblox.com/asset/?id=108597653"]] end
if msg:sub(chk1+1):lower() == "batman" then teststr = [[BrickColor.new("Really black") local dec = Instance.new("Decal", p) dec.Face = 2 dec.Texture = "http://www.roblox.com/asset/?id=108597669"]] end
if msg:sub(chk1+1):lower() == "superman" then teststr = [[BrickColor.new("Bright blue") local dec = Instance.new("Decal", p) dec.Face = 2 dec.Texture = "http://www.roblox.com/asset/?id=108597677"]] end
if msg:sub(chk1+1):lower() == "swag" then teststr = [[BrickColor.new("Pink") local dec = Instance.new("Decal", p) dec.Face = 2 dec.Texture = "http://www.roblox.com/asset/?id=109301474"]] end
if BrickColor.new(teststr) ~= nil then str = teststr end
end
for i, v in pairs(plrz) do
coroutine.resume(coroutine.create(function()
if v and v:findFirstChild("PlayerGui") and v.Character and v.Character:findFirstChild("Torso") then
for a,cp in pairs(v.Character:children()) do if cp.Name == "EpicCape" then cp:Destroy() end end
local cl = script.LocalScriptBase:Clone() cl.Name = "CapeScript" cl.Code.Value = [[local plr = game.Players.LocalPlayer
repeat wait() until plr and plr.Character and plr.Character:findFirstChild("Torso")
local torso = plr.Character.Torso
local p = Instance.new("Part", torso.Parent) p.Name = "EpicCape" p.Anchored = false
p.CanCollide = false p.TopSurface = 0 p.BottomSurface = 0 p.BrickColor = ]]..str..[[ p.formFactor = "Custom"
p.Size = Vector3.new(.2,.2,.2)
local msh = Instance.new("BlockMesh", p) msh.Scale = Vector3.new(9,17.5,.5)
local motor1 = Instance.new("Motor", p)
motor1.Part0 = p
motor1.Part1 = torso
motor1.MaxVelocity = .01
motor1.C0 = CFrame.new(0,1.75,0)*CFrame.Angles(0,math.rad(90),0)
motor1.C1 = CFrame.new(0,1,.45)*CFrame.Angles(0,math.rad(90),0)
local wave = false
repeat wait(1/44)
local ang = 0.1
local oldmag = torso.Velocity.magnitude
local mv = .002
if wave then ang = ang + ((torso.Velocity.magnitude/10)*.05)+.05 wave = false else wave = true end
ang = ang + math.min(torso.Velocity.magnitude/11, .5)
motor1.MaxVelocity = math.min((torso.Velocity.magnitude/111), .04) + mv
motor1.DesiredAngle = -ang
if motor1.CurrentAngle < -.2 and motor1.DesiredAngle > -.2 then motor1.MaxVelocity = .04 end
repeat wait() until motor1.CurrentAngle == motor1.DesiredAngle or math.abs(torso.Velocity.magnitude - oldmag)  >= (torso.Velocity.magnitude/10) + 1
if torso.Velocity.magnitude < .1 then wait(.1) end
until not p or p.Parent ~= torso.Parent
script:Destroy()
]] cl.Parent = v.PlayerGui cl.Disabled = false
end
end))
end
end

Is This What You Mean adark?