Just off the top of my head I know that Pennsylvania (King of Prussia Hermes) does not charge sales tax on clothing and scarves are included in that amount but I don't know about other items such as handbags. I only know of one other state that doesn't have a sales tax but there is no Hermes there (Oregon).
Hermes in Hawaii is a good deal because their sales tax is only 4.85% (or close to that). That's a nice savings on a big ticket item. However, if you have something shipped to you in another state you will be charged the state or local rate.
This is why I try to buy shoes, clothing and H scarves in NJ rather than my home state of NY where the local sales tax is 8.125%. Unfortunately tax is added when I have to get items ordered and shipped home from stores that have a presence in NY, even if I "bought" them in NJ.
Luckily the NJ H boutiques are closer to me than the NY ones.