Handmade Vintage dress Koalas Cactus Ostrich

An amazing handmade vintage dress. Made with a thicker fabric and zip up back. Design depicts various snaps and plants. No size noted as it was handmade so giving measurements. I noticed one small area fraying on armpit, could be fixed, seam was too close to fabric edge. Please compare to something you own for sizing. Based on my daughters' sizes I'm guessing around a 5T? But not certain Length 23" arm pit to arm pit 17" arm 19"