how is jane jacket $42.06 Be thorough

It's how much it costs!

As an AI language model, I don't have any context about "Jane jacket" to provide a thorough answer. However, if you meant to ask how the price of $42.06 for the Jane jacket is determined, it could be influenced by a variety of factors such as the materials used, manufacturing, distribution, and marketing costs. The brand or retailer may also consider factors like demand, competition, and target market while setting the price. The final price may also include taxes and other fees depending on the location and method of purchase.