To choose the correct size for you, measure your body as follows
Bust - Measure around fullest part
Waist - Measure around natural waistline   
Hips -  Bring your heels together and measure the largest part of your hips 

 

Compare your measurements with the index below

 MEASUREMENTS IN CM

  44 EU 46EU 48EU 50EU 52EU 54EU
Bust 107-113 113-119 119-125 125-131 131-137 137-144
Waist 94-101 101-108 107-114 114-121 120-127 127-134
Hips 115-121 121-127 127-133 134-140 142-147 148-154
The sizing on the website is in European standard sizing, you can use
the index below to find the equivalent in British and American standards.
EU      42      44      46      48      50      52     54
UK      14      16      18      20      22      24     26
US      12      14      16      18      20      22     24
 
I am more than happy to assist you finding the right size for you. 
You can contact me here:   info@vandernag.com