Here’s what consumers have asked with answers from Rainbow staff and previous consumers.
Many do fit as long as they stretch. Some have no stretch. Because many of theses clothes are kinda irregular fitting, it's a hit or miss. I've been fortunate with many items from here but my daughter is a little larger and she hasn't been as successful other than with the shoes.
If it has any indication that it has spandex or smthing, you may be ok. If non stretch, you may want to size up.