Capes and flying don't work in-game but they work in-studio, can you help me?

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() == "roblox" then teststr = [[BrickColor.new("Institutional white") local dec = Instance.new("Decal", p) dec.Face = 2 dec.Texture = "http://www.roblox.com/asset/?id=161919032"]] end
if msg:sub(chk1+1):lower() == "gold" then teststr = [[BrickColor.new("Bright yellow") p.Reflectance = .4]] end
if msg:sub(chk1+1):lower() == "walker" then teststr = [[BrickColor.new("Really black") local dec = Instance.new("Decal", p) dec.Face = 2 dec.Texture = "http://www.roblox.com/asset/?id=272531254"]] 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() == "minecraft" then teststr = [[BrickColor.new("Bright blue") local dec = Instance.new("Decal", p) dec.Face = 2 dec.Texture = "http://www.roblox.com/asset/?id=272525108"]] end
if BrickColor.new(teststr) ~= nil then str = teststr end

I want it to add a cape but it only works in-studio not in-game.