The second disguise is that of viola. This is more of a literal disguise where she dresses to look like a man. she does this for various reasons such as being unrecognizable and obtaining a job. No one knows about this except the captain. The is an on purpose disguise for the benefit of a normal life and survival. She says, 'conceal me what I am, and be my aid. 'In her disguise the captain is her helper. This helps with the development of the plot because viola in her disguise becomes the man that Olivia falls in love with and unveils herself for.
The third disguise is Sir Toby. He is Olivia's uncle. he pretends to be Andrew's friend but this is only to obtain his wealth. He is