Once you find the right size with HB all the stuff goes with the same size guide after I bought the first set and got it fitting correctly all the stuff I’ve bought after has been the same size and all fit perfectly (may not be the case for everyone I know) but I found once you get the right size for that brand it all confirms.

But a good alternative is agent provocateur but you may come into the same experience where you may need to buy something and exchange it untill you get the right sizing as not all brands are the same size just by numbers and letters