Not really. The vast majority of pre-packaged bread is typically sliced to the same thickness (I’d guess roughly 3/8"). If you buy a fresh loaf at the store, they can slice it for you, but I’ve never encountered either a grocery store or traditional bakery to have an adjustable slicer; you still get that same 3/8"ish slice. Occasionally, you’ll see a “specialty” loaf – like texas toast or Pepperidge farm thin – that’s pre-sliced differently.
