How conservative does interview attire have to be?

So I have my first interview in about 3 weeks and need to pick out what to wear. I have a navy suit and will go with brown shoes but my style has never been "conversation" but more trendy and fashion forward. I want to wear suspenders and keep my facial hair (curly mustache) but I don't know how that would fly. I know suspenders are traditionally conservative but would it come off as weird to wear at an interview? And are cufflinks frowned upon also? I asked my mentor all of this but idk if... How conservative does interview attire have to be?
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Source Type: forums