Live and learn...
The above refers neither to St Luke, nor St Thomas Aquinas, but to sizing of women's clothing, to which, I am sure you are aware, many of us are somewhat sensitive, (what with pretty normal sized women being implicitly referred to as large pieces of furniture by famous designers, and all....)
Well, who knew there was such a thing as 0X? (that is a zero followed by a capital ex.)
I suppose the zero part is meant to flatter the potential purchaser who is of the large-but-not-as-large-as-she-could-be sort, (such as myself,) "zero" has a nice ring to it, but the subliminal message surely mitigates against separating the customer from her money?