Fairy Tale in eyelet

Hi all, I am getting ready to make my 2nd Fairy Tale dress (first was a "Baby Anna" Halloween costume, seen here https://flic.kr/p/pKCL6H). This next one will be a toddler party dress, worn to a semi formal summer wedding. I plan to make view A, leaving off the belt/bow. I go back and forth on which collar I want, open to suggestions on that too! The fabric I've picked out is a pink circle eyelet from Joann's "Doodles" collection, a pink/coral cotton and of course pink tulle. I am wondering if it makes sense to construct the dress as the instructions say (eyelet as main fabric, cotton as lining) or if I should underline the eyelet and then also line it? I don't want it to be too heavy, this is for a July (indoor) wedding and it's sticky here then! Thanks for any tips! I plan to make the same size (2T) as "Baby Anna" as that still fits and gets plenty of wear. She is a skinny just turned 3 who wears 3T in RTW. Since this is for a wedding, I want it to fit properly for the event - even if she outgrows it right after.