Common Mistakes When Buying Jeans - as part of the Women's Style series by GeoBeats. Common mistakes that women make when looking for a pair of jeans are not buying the right size. You don't want them to be too tight or too loose, and you do have to factor in laundering and how that is going to change the fit of the jeans in the long run. We also need to really look at style when we are trying on jeans. Certain styles are going to look great on you while others may not. So find your style and find your correct size and it's a home run for you. You also want to make sure that you buy for the style that is good for you and not necessarily a trend. I know I have a stack of jeans in my closet that were very of the moment and trendy but I have never worn because they just don't look right on me.