dating rayon dress with “lot” tag

[jess k]

hello all,
i have a dress that was said to be from the 1940’s. it looks like the cut/style of the time, but i wonder when these “lot/size” tags were put into use. photos of the tag & dress here for reference. thanks very much for any input!

 

[Jonathan]

Looks mid 40s to me - 44-47

 

[The Vintage Merchant]

love that print!

 

[jess k]

love that print!

i love the time/sun fades on the fabric, too!