Is it true that clothes are modeled after the hour glass figure?

If it is true, then why is it that I can NEVER find clothes that fit? I have an hourglass figure, but NOTHING ever fits me probably, it is like they make clothes for rectangles. The bust is always too tight, and the pants are always too tight around my hips, but then, I have a tiny waist. It really pisses me off. Do you think that they are modeled after the hour glass, or rectangle.
And for reference, I am a 36-24-39