Because of the vast disparity in sizing for clothing manufacturers, there is no standard waist measurement that coincides with a size 29 in jeans; a size 29 can mean a waist measurement of 28 inches up to 29.5 inches, generally. However, even this is not always true, with some manufacturers considering a size 29 smaller or larger.
The exact measurement of a size also depends on the cut of the jeans. Styles designed for curvier women will often be larger than straight or skinny styles, even though both may be labeled a size 29. It is always best for shoppers to try on jeans if possible to ensure the sizing is correct.