I had to send back a very nice mail order coat recently because even though the company's sizing guide had three different measurements which you were meant to take before ordering (hips, waist and breasts), there was only a single clothing size given for each coat.
Somewhat confused, and with the only illustration picture being of some stick thin woman with miniscule breasts... I ordered the size relevant to the largest measurement because my boobs are 6-8 UK clothing sizes larger than either my hips or waist (depending on the manufacturer). For that coat, they were at least 6 sizes larger than either my hips or waist and so I ordered the "6 sizes larger" one.
The coat actually fit really well in the boobs, albeit quite snugly... but other than that the coat made me look like a yurt.
Because of this it was hopelessly unflattering and fitted appallingly apart from the chest section, and so it had to go.
I appreciate that there is limited space in the catalogue, but it would be better if clothing companies were at least prepared to have pictures of different sizes of coats (not just the tiny ones on skinny models who have tiny breasts) on their website, where there is infinite space to supply different sizes/shapes of model wearing coats.