Help! What to wear to my late September baby shower?!

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Silly post - I know! But I can’t find a dress I like for my baby shower!

Shower is in NJ in late September, so weather could either be summer or fall. Shower color scheme is black/white (we don’t know the gender). Black is usually my “go to” color for dresses but I don’t want to blend in with the decor or look morbid.

Can anyone recommend a good online maternity store for dresses?