I bought these similar cardigans for cheap at the mall which I wear daily and I did get good use out of them so I was on a hunt to find more of these open cardigans and I'm so greatful that Patty had them!!  These are def more for spring/fall as it will not keep you warm but love the style!!  I'm 5'4, 120LBS, A cup and I went by their suggestion and got a SM and it was perfect!  It says it may take up to about 2-3 weeks to deliver but I got it after a week. Yey!!  Fast shipping, great packaging, and I'm already about to order more from Pattys.  Thank you!!

UPDATE: 4/18/16
I bought this black cardigan 4 years ago and finally decided to buy another one as my original has been faded for quite sometime now but having gone through plenty of washes/dryer, to say the least as I wear this almost on a weekly basis, I'm surprised how well the material has held up after all these years.  I'm glad Patty never discontinued this style cardigan because I love it and will continue to purchase it as long as they have it!  I'm 5'4 and now at 137 lbs (after baby), 36B and the small still fits perfectly since the material is stretchy and the length is perfect for me as it goes down mid-rear.  I've bought a few different type of Patty clothing but all have exceeded my expectations in quality for the price.