Paul Poiret was one of the most influential designers during the early 20th Century and he played a major role in shaping haute couture and the fashion industry as we know it today. Most notably, Poiret helped ensure the demise of the corset, and especially it’s most recent incarnation in the form of the s-bend corset, and introduced new designs that moved fashion away from highly structured silhouettes to more loose ones based on draping rather than tailoring. Also, Poiret was noted for the development of the hobble skirt and the “lampshade dress” as well as incorporating oriental elements in his designs.
Here we see just one example of the “lampshade” dress style from 1912:
However, lost in all of Poiret’s achievements is consideration of his ideas, or “philosophy” were about dress itself. One charge that is often laid on haute couture and their designers is that wealth automatically equates to good or “correct” dress. To Poiret:
This art has little in common with money. The woman whose resources are limited has no more cause for being dowdily dressed than the woman who is rich has reason to believe that she is beautifully gowned. Except in so far as money can procure the services of a good dressmaker, of an artist who can judge his customer’s style and garb her accordingly, the wealthy woman stands no better chance of being correctly dressed than the woman who must turn every penny before spending it. 
While the above is almost a truism when it comes to fashion, at least today, it’s still revealing coming from the man who had crowned himself the “King of Fashion.” Poiret further expands on this theme, stating that dressing is:
…not an easy art to acquire. It demands a certain amount of intelligence, certain gifts, some of them among the rarest, perhaps—it requires a real appreciation of harmony, of colors, ingenious ideas, absolute tact, and, above all, a love of the beautiful and clear perception of values. It may be resumed in two words, good taste. 
So, what is “good taste” to Poiret?
Taste is by no means developed by riches; on the contrary, the increasing demands of luxury are killing the art of dressing. Luxury and good taste are in inverse proportion to each other. The one will kill the other as machinery is crowding out handwork. In fact, it has come so far that many persons confuse the two terms. Because a material is expensive they find it beautiful; because it is cheap they think it must be ugly. 
The above is as true today as it was back then and we see it in the fashion nearly every day. Naturally, “good taste” can be somewhat subjective, depending on time and place but it still gets to the idea that one cannot simply buy their way into good taste, or by extension, good fashion.
Here we see a sample of the fashion illustrations that Poiret commissioned by various avant garde artists such as Paul Iribe. Here we see a definite revival of the simple vertical lines of the empire dress style:
Poiret also notes that:
In order not to appear entirely at odds with her surroundings and the place where she lives, a woman is obliged to follow fashions to a certain extent. But let that be within certain bounds. What does it matter if tight skirts be the fashion if your figure demands a wide one? Is it not important to dress so as to bring out your good points rather than to reveal the bad? Can any idea of being fashionable make up for the fact of being ridiculous? 
And there it it- Poiret gets to the heart of the matter by pointing out that fashion is about emphasizing one’s good points rather than the bad, something that holds true today as it did then. The above has been only a small sample of the depth of Poiret’s fashion “philosophy” but it’s interesting to see that his ideas still hold true today in many ways and as such, they represent a distinct break with the 19th Century.
1. Principles of Correct Dress, Florence Hull Winterburn, New York: Harper & Brothers, 1914, p. 237.
2. Ibid., pp. 237-238
3. Ibid., p. 239
4. Ibid., pp. 240-241