appropriate to wear to baby shower?

My baby shower is a couple weeks away and my SOs family is throwing it. I want to wear an off the shoulder shirt but my SO thinks it's inappropriate.. I also want to wear heels but he thinks it's "too much". I want to wear jeans with it so the only body part that would be showing is my shoulders.. is that inappropriate or is he overreacting? 
(IF YOU THINK ITS INAPPROPRIATE, please drop some suggestions of what I should wear, including shoe suggestions)

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