What color leggings and cardigan (or shirt underneath) should I wear with these rompers?

you do not wear leggings with rompers. but for the fall when you go back to school like the first week you can wear a romper and a cardigan over it so its more like dressy school like with some nice flip flops or heels. that first romper that first link you can wear a plain white cardigan with that romper.the 3th one is like school wear you can wear a black cardigan over that. the last one is really cute but that is just one you can wear on its own the grey one. hope i helped.