I've tried to do a similar version myself where any skintone shows through - but the way I did it only made the skintone under look transparent white, so I guess there's no way of doing it, then.... (unless you make one version for each skintone you want it for, of course - but that's just too much job...)
Awww.... I've been waiting anxiously for you to update this Raven with your wonderful infant outfits! I understand if it's too much work though, I wish I knew enough to be able to work on the project with you. :smile: