A lot of people say that horizontal strips make you look smaller and fatter. I ordered a new sweatshirt and showed it to my mom. She said it was a very bad choice. Although, there are a lot of studies that say it's just a myth (while a few support it), but still... what do you think?
I got both types, stripy clothes and ribbed, can't see a difference at all. Then again Im pretty slim anyway and will mostly look so no matter what I wear. Both types do make my ass look bigger though... Maybe that says something.
They might make you look shorter and fatter, but they also make your boobs look bigger, so someone who is healthy shouldn't have any problem wearing horizontal stripes. I like both horizontal and vertical, so it doesn't matter to me.
There can be good and bad striped patterns, so I can't say anything about your shirt without seeing it. Regarding the pic you posted though, I would not choose vertical black and white stripes unless I was a referee of some game, lol.
I agree that at times, and with certain clothing items that it can look a little horrendous and make someone appear larger, but I have a few extremely cute tops that have horizontal stripes, so it can't be with all clothes :)