For the clothes that OTMA wore, they were different than her mother and grand-relatives. For example, the Victorian corset was very different in appearnace compared the the Renaissance corset etc. Here's what I mean about the "loose" no corset look. I also aree with lanie about the age of 16 being "corset age".
As you might see the bodices are very loose, while the Victorian corset is usually worn with very tight bodices;on the fact i have never seen a picture of Alix wearing anything but a tight fitting bodicedress when she was in the court of her grand mother and when she was younger.
See:
The corset is very tight and creates a bell shaped "bosom":

and here's a loose one:

In some pictures of the Russian Court pictures, you can see Olga, Tatiana and Alexandraq are wearing very stern gowns with the hard bodices.

