For a 150 lb. 5'2" person with 40" bust the small petite was perfection! I even fit into the XS regular length but opted for the petite to show off my legs. I typically wear a large petite in all ON dresses but luckily this was a return in store that I was able to try on and for the final sale price... of less than $20 this is a steal! It's just a step into dress, no zippers or anything, just elastic at the top and it is lined. The length on me in petite was exactly as shown on the size small model online. For taller folks the regular length will still hit above the knee (it did on me as well) and the tall length will as well since this is for sure a mini length item. Fabric is lovely, an easy steam does the trick and of course the pockets are an added bonus - I plan to wear this to ladies brunch or any other fun occasion, yay!