"To compliment the dress" means to say or do something nice about the dress, highlighting its attractive qualities or expressing admiration for it. Full definition
The crochet top compliments the dress perfectly, and the belt just pulls it all together. (jeansandateacup.com)
Love both the dresses and the sneakers compliments the dress. (anamikaojha.com)
Even the makeup compliments the dress, the bright aqua liner on the lower lash line is a subtle, yet fun contrast to the orange of the dress. (theblockishaute.com)