I am 5'3" and weigh 128 lbs. I ordered a size S, and they fit just as I wanted them to. I think I could have also gotten the medium size, may fit well too. I now own 5 pairs of pants, including summer pants from Bogekis, because they are incredibly comfortable. The fabric is soft, and they allow easy movement. They wash well without shrinking. I prefer to hang them to dry, so I can't say if they shrink in the dryer. Also, they haven't developed any pilling. These pants can be worn not only at home but also for running errands, walking, jogging, etc. I highly recommend these pants.