Hugo Boss is big in Europe and being from Europe it's hard to find retailer that has a wide variety of Hugo Boss clothing. The 2 Hugo Boss shops in the Philadelphia area that I know of are in King of Prussia Mall and in Sagemore, Marlton, New Jersey. The sales staff is so friendly and give great advice on their clothing lines. With many stores charging you extra for alteration when you purchase an item on sale, Hugo Boss has maintained the free alteration offerings even on sale products.
This sales staff lets you walk around the store without interrupting your shopping experience, unlike other high end store where they follow you like you are trying to steal something.