Shops that have cottage inspired clothing for SD?

I have had some luck in buying cheap porcelain dolls from thrift stores and being a close fit for my SD girls. Especially for the style you are looking for, this might be a good option.

 

I too am looking for shops with this style actually. In both SD and MSD (that is NOT minifee sized). I've done what @clericriff suggested and found many usable pieces this way. Some things may need to be modified, however.

 

I can't be a terrible lot of help because I do not shop for my dolls at this point, but I've noticed, in what I see from seamstresses, that I would say there is probably a lot to choose from in the Asian based market. There are many closely related clothing styles like Mori and a very romantic antique feel that I see being sold on 1/3 Volks models. They may lean heavy on Sd10 size but it's probably worth a thought. So if you know of sites that need shopping services that's probably a goldmine. I do think there are a lot of cute classic dresses that are perfect for cottage core styling if you rummage through dealers like Alice's collections because of the style of dress being kind of an old staple in early bjd clothing aesthetic.
If I notice a relevant artist come across my feed again I'll try to come back and link. But I have a pathetically hard time stringing identities of accounts together across social media.