Yes, you can send bitcoin from a legacy account to a segwit account. However, there are a few things to keep in mind. First, when sending from a legacy account, the transaction will likely be larger than if it were sent from a segwit account. This is because the legacy account will likely have more inputs than a segwit account.
Second, the transaction may take longer to confirm as it will be competing with other transactions in the mempool. Finally, fees may be higher when sending from a legacy account to a segwit account.