I would say just slightly large. I tried on a TR dress a couple weeks ago in an empire waist style, size 4 and it was slightly loose - I'm 5'2"/113/usually a 2-4 in most brands.
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To be yourself in a world that is constantly trying to make you something else is the greatest accomplishment ~ {Ralph Waldo Emerson}
I am generally a two, but sometimes a four, and on rare occasion (ok, once) a six. I guess that means a two would be best. If you look at their sizing charts I would have guessed a six! Never trust those charts...
I should also include that the dress I tried was quite voluminous in the waist/hips area (if any area would cause me to size up, this would be it!), so if that is true for you too I would take it into consideration. If the shipping is free, maybe order a 2 and a 4? I would really highly doubt that you'd be a 6 though . . .
__________________
To be yourself in a world that is constantly trying to make you something else is the greatest accomplishment ~ {Ralph Waldo Emerson}