Q:

What does the phrase 'I feel like a pig in a wig' mean?

I heard this phrase in an interview:

I feel like a pig in a wig.

I understand from the context that it is like nothing, ugly or something similar.
I have read that they use words that sound good together to express a feeling or so.
Could you help me understand this better?

A:

It means that something or someone who is usually considered to be unattractive is attempting to look more attractive through the addition of some superficial ornament (clothes, make-up or, indeed, a wig) that, however, fools nobody. 
A similar phrase is "mutton dressed as lamb".

