My Life As brand Harry Potter accessories.

I can't speak for this brand specifically, but many prop items made for 18" American Girl or similar size brands are often compatible with MSDs. MSDs are on average around 16-17" in height, sometimes even up to 18"

Based on the images of the My Life As dolls that are pictured with accessories, the scale looks like it would be great with MSDs.

 

I only have the Honeydukes set. The cart is great for MSD. The treats to me are a bit big for them. They fit better with my bigger boys.

I still want the Potions set one day.

 

I got the sorting hat set. ($10) The hat itself fits on my SD Luts Cain head (with wig) and the scarf fits another SD boy as well. It comes with 4 cards and a spinner, but I mainly bought it for the scarf.

 

All the Miniverse and Re-Ment magical stuff is great but only works for teeny tinies or slender 1/6 scale, and the pinhole hacks on line do work, but they feel small in Yo-SD hands.

But now is the time to hit Michaels and the occasional Dollar Tree as they have bottles and other decor that are more BJD sized. It's easy enough to make fake covers for sticky note pads to turn them in to books.