A traditional look for your living room will involve choosing the right types of furniture. You will want to look at Queen Anne style chairs, Wingbacks, and smaller framed pieces. You can still find reclining wingback chairs also, so you don't have to give up comfort for style. Sofa's will have curves (camel back sofas and pleated skirts are also very traditional looks).
Rolled arms and nail-head trim are a traditional design that you will find with many leather sofas and chairs. You may find the nail-head trim with certain fabrics as well.
You will find that tables will usually be smaller in scale and cherry finishes are often used to create a traditional style.
To set off your traditional look, add some accessories which will add to the decor. Don't forget drapes, lamps, and throw rugs to really add extra appeal.