This is one of those times where you have to carefully consider what other people's feelings and emotions will be, based in your own actions.
Choosing to dress as an officer of the SS WILL cause offence to other people as you will be a physical representation of the atrocities that were commited. Even if you don't mean any offence, it will be caused.
If I was you I'd do some research into what the SS did and I don't mean just read Wikipedia. Go to the library, get some books out and learn what happens. The SS commited many many attrociates killing innocents, including women and children, simply based on their beliefs. Crimes so horrendous that they cannot and should not be forgotten. I very much doubt you will want to wear an SS Uniform once you see what they represent, regardless of how smart or stylish they look.