I would like to wear it without a bra, so I'm hoping it's not that see thru. I'm 5'5" 127lbs. I'm thinking by the size chart that a small would fit right. I normally wear a juniors size 5 or 7 and a womens 2 4 or 6 depending on the pattern. I don't want to order a medium and have it be too big or a small be too small. What size would be appropriate for me according to my weight and measurements