Bare shoulders are not allowed at work. Would wearing a close-fitting t-shirt under a sleeveless dress work? I can imagine it would look OK under a dress with squareish straps and a squareish neckline - a bit like dungarees, but what about under other styles? Would it work to wear a t-shirt under a dress with spaghetti straps, or a halterneck, or with a v-neckline, or with tailoring/shaping around the bust?