Vintage newborn/infant ivory cover gown with matching bonnet. Possibly a christening/baptismal cover gown. Cover has a large, rounded collar with lace detailing matching lace detailing on the bonnet. Two buttons on neckline for closure. 
Note: Some discoloration due to age, wear, and exposure. 
Size: 
Cover gown: No tag listing size but closest to newborn/infant
Bonnet: One size fits all