I can't speak French. But I saw this on some of the De Young Museum's souvenir merchandise. (Like t-shirts and bags) Apparently it was the old motto of Yves Saint Laurent. It means "Fashion passes, style remains". I don't really get it, so good luck to you figuring it out.
...Maybe I'd better clarify, before everyone gets confused. My family has membership to museums in San Francisco, and we heard there were some new exhibits, so we went to see the De Young and Legion of Honor (both art museums). At De Young, the special exhibits right now are 1) Yves Saint Laurent, and 2) Andy Warhol...While at Legion of Honor, the special exhibit is Artistic Luxury - Fabergé - Tiffany - Lalique.
Yves Saint Laurent is a French, high-end clothing brand. Apparently the guy who started it and owned it (until he died of brain cancer o_O ) was called Saint Laurent. The clothing in the museum wasn't all that old, I mean, my parents were alive then (1960's was around the oldest of the clothes displayed) but still, flash photography seems to damage clothing and art for some reason, so this guy in a black suit leaped out to stop a woman who was taking pictures with her camera. (That must be what those security guards do...I always thought it was weird since they usually just stand there, or walk around looking at you)
Anyhow, the YSL clothing is kind of odd. Some of it is really freaky, like this black, tall hat, and a "wedding dress" which covers you and makes you look like a little dressed-up doll. Here's some pictures of various types. (The third one is really disturbing, but apparently it is also a wedding dress)
And about Andy Warhol...He was an artist, who painted portraits of people, designed record album covers, acted as producer for some band called Velvet Underground (no idea what that is, even my dad doesn't know), and made short movies. My dad wanted to see a picture of Chairman Mao which Andy Warhol created, but apparently that picture isn't featured, so he was quite disappointed. I was pretty freaked out since when I walked in there was a little sign to the side that said there was nudity in the exhibit. Still, people bring their kids in!!
Finally, about the exhibit at the Legion of Honor...Carl Fabergé, Louis Comfort Tiffany, and René Lalique were all male jewelry/decorative art designers. Just so you know, the Tiffany's products we see today are from the same Tiffany's company in the exhibit. I thought Louis's name was weird, since Comfort is an actual word, and Tiffany usually seems like a girl's first name, not a last name.
If you like shiny things, you should look at that exhibit. It had a lot of things, like Easter eggs (made of rare stones, and they were bigger than usual eggs; sometimes there were other decorative items put inside the eggs) and combs (like a comb made from the shape of two swallows, carved out of wood; looks pretty, but would you want to use it?) and even dog collars (whoa, they look so expensive, people would probably steal your dog just to get the collar).
My feet got really tired from tromping around all day. My mother thinks that I need to exercise more, but...that's a different story. If you want to go to San Francisco's museums, and need a bite to eat, go to the cafe on top of De Young Museum. It has tasty food. :D