I should have been more specific.
My HL shoes are tagged a size 8, which I understand to be based off UK sizing. I'm normally a UK size 8.5 (Costume National, Puma Platinum, Jil Sander, etc), which converts to a US 9.5. I just simplified it to say '1 1/2 sizes larger than your normal size', and was making a direct comparison to standard US sizing, since for me HL 8 = US 9.5. I hope that makes sense.
Your feet may work differently, don't know. I would ask the seller for a toe-to-heel measurement just to be sure.