Years ago I saw a movie about a couple who moved out of big city and bought a house (I believe the husband was an architect?). Anyway the wife was checking out the attic and found a chest with a wedding dress. There was a large mirror also. She tried on the dress and was immediately transported to the late 1800. Each time she puts on the dress she relives the very romantic life until she finds out that her to-be husband is killed so she tries to find out who killed him so she can change history. Does anyone know the title?

I am not sure but it sounds very familiar to a movie entitled, The Two Worlds of Jennie Logan (http://www.imdb.com/title/tt0078430/plotsummary). (1979)

Gem_22205 is right, it is The Two Worlds of Jenny Logan. Sadly it is NOT available on DVD. But... there are a few bootleg DVD copies out there for sale. Too bad this will be the only way to enjoy this great made for TV movie.