Margay Cat Print Silk Shirtdress

I’m 5,8/ 150. I often wear size 10 and 8 or even 6 in St. John as it usually runs large. So for this adorable dress I ordered size 8. Big disappointment, it’s very tight and opens between the thighs. I can move the arms tightly but the around the hips and thighs doesn’t work. The dress runs very small , size 8 like ordinary size 6. Solution, either one: I grab the opportunity to loose 4 pounds or return it. I’ll try loosing some weight!