Reliable method of getting the Shirt or Pants ID? [solved]

So, with getting the ID from shirts or pants, it's usually Asset - 1, but not always. Is there a more reliable way of getting it than just subtracting 1? This is my script, but it doesn't load the clothing.

frame.btnPurchase.MouseButton1Click:Connect(function()
    if chosenId > 0 and player.WalletBalance.Value >= price then
        local assetSelect = game:GetService("MarketplaceService"):GetProductInfo(chosenId, Enum.InfoType.Asset)
        local itemType = ""

        if assetSelect.AssetTypeId == 11 then
            itemType = "shirt"
        else
            itemType = "pants"
        end     

        chosenId = assetSelect.AssetId - 1
    end
end)