Personally I think wanting to return an item because it doesn't suit a person - when it comes to clothing - is perfectly valid.  Colours can look different on computer monitors for example.

I have a favourite seller and buy dresses and tops from them in two particular styles.  On one ocassion I ordered a dress in the same size and material, but the neckline was square instead of v line.  What a disaster.  It was too wide across the shoulders and it didn't suit me at all.  The seller provided dimensions but not the width of the square panel across the shoulders. The photos of it on the models (who had modelled other dresses in v line) looked fine.  But it wasn't....at least not on me.

Clothes are a much more personal subjective choice.