I tried the same outfit on all of my 1/8 scale dolls.

The hat is tight on Secretdoll and the sleeves too long. The shoes are also too big, but her feet are a bit smaller about 7/8" long and narrow.

 The hat fit Lati Yellow doll with her wig. The clothes were a bit too big also.

Impldoll Verne fits the hat well with his wig on. His paws are a bit large and had to be worked down into the sleeves carefully. The shoes fit well also.  Verne is my best poser right out of the box. 

The sleeves are long on Tyltyl but I discovered I could roll them up a little. The shoes fit well enough they don't repeatedly fall off the doll. 

 The same situation happened with my PongPong doll. The sleeves are long. The top is big enough to be a dress. The hat fits with a wig on. The shoes keep falling off. 

 I didn't even try it on the Imda 1.7 sized doll. The hat is too big even with a wig. The overall outfit really doesn't work for me without the hat.

Overall I have found that if I want the outfit to fit the doll, it has to be made with the doll in hand. There is no one size fits all scale for everything on the dolls I have on hand.