I want to return clothes I didn't like
Why do want to return them?
It's something that I got as a Christmas gift and I didn't like it, so I want to exchange it.
It is hurtful to return a gift if you don't like it, because someone put a lot of thought into choosing what they thought you would like.
I want to return it because it hurts me to look at it.
In that case, if it is really distressing to you, then you should feel okay about returning this gift.  However, you should be ready to politely inform the giver that you simply didn't like the style, and that you swapped it for something very similar.  You might hurt their feelings if you are too blunt.