How do I dress 1949 style using clothes from home?

Fashions come back around over the years, so you could definitely use modern day clothing styles to get that '40s look. You should go for patterned dresses to the length of a credit card above the knee that are bright colors but simple -- maybe dots or flower patterns. Skin color tights would work well, but, if you wish to try stockings instead, choose skin color ones with simple black suspenders to hold them in place: you can get both these from Marks & Soencer or Victoria Secret. For heels, go with brightly colored ones with a simple strap.