I disagree. There are minor details which can be popularised through time with regards to make up and clothing, but there are definitely beauty traits and ideals to look to. If you look at paintings of Marie Antoinette and other figures throughout history those looks would still be competitive in today's world. The science behind this mostly points to an innate preference towards symmetry, the more symmetrical the face, the more beautiful someone is regarded. This is shown even in babies, so it's unlikely a societal trend. I suspect there may be further preferences like these depending upon the sex, especially with regard to body proportions, and it's this reason that obesity will never be truly accepted as 'beautiful'. With regards to your example, women nowadays may be thinner than in the 1900's but there's a very defined hourglass figure on all the women mentioned in that article. The science also suggests waist-to-hip ratio is a defining aspect of how beautiful a woman's body is. We see the golden ratio in nature all the time, and this extends to the proportions in both the male and female body. This is why I think that there may be trends and influences which, thinking about it, may be more indicative of wealth, but there will be a beauty standard that throughout time is adhered to.