Straight leg jeans are defined by little to no variation in the width of the jean from the knee to the hem. They fit over most boots, but do not flare at the bottom. Levi's® women's 501® jeans and 505® jeans are good examples of a traditional fit with a straight leg while the 504™ slouch jeans have a looser waist band for, well, a slouch look.
"Excellent!!!!!! I bought six pairs of jeans. I tried the 514, 512, 501, and 511 styles of Levi's. The 514 was far away the best fit and look!!! It's the perfect fit and Langston's has a great price. The 501 was a little more baggy but also looked second best..."