It didn't take Alex long to size up the situation.
As regards the dentition of the existing species, the cheek-series consists of the four premolars and three molars above and below, all in contact and closely resembling each other, except the first, which is much smaller than the rest and often deciduous; the others gradually increasing in size up to the penultimate.
Double check your measurements and consider ordering one size up to ensure a good fit.
Usually, it is easier to size a dress down than to alter it a size up.
Bear in mind that these are basic figures; some manufacturers may size up or down just slightly.