This reminds me of my friend, actually. Before, she wanted to buy a new pair of headphones. Now, I didn't really know a lot about headphones, but I offered to read up for her so I could give her my recommendations. I asked her if she had any prospects in mind and she said she was thinking of getting Skullcandies. She knew I didn't approve so I asked her why she wanted them and she said, "Well, my Mac has a green wallpaper, I just bought a green sleeve for it so I want green headphones to match. They sound the same to me."
And I couldn't say anything.
Edit: Okay, to have something to do with outfits, there was a time my brother asked me to look for a pair of earphones for him. I asked him what price range, etc etc and he said "Get me something that matches my clothes." [---> and he said this to someone without fashion sense... :| ]