black fits small white fits big. other colors are tts though tiff tends to be a lil smaller too.
Diamond prints on AAA so any brand that uses that will prolly follow that guideline. I've actually found in XXL (what I wear) that the fit is more comparable with whites and colors fitting semi the same. I'd say if you get a small in white sticker with a small in colors and medium in black. Or go to zumiez and see if they have any diamond to try on.