The first steps to dressing like a celebrity is finding some good images of people wearing the clothes you would like to wear. The best way to do this is by using Google images. You can save the images to your computer or tablet, alternatively print them out and make a scrapbook. You could also go through all your old magazines and cut out any photos which appeal to you.
The best people to follow will have the same sense of style which you aspire to and are of a similar age bracket. It's also good to follow people who have the same hair colour and complexion. Be mindful of their body shape, as it may look fantastic on them, but not so great on you. They will probably have a stylist behind the scenes (even for those candid looking street shots).
After a while you might start to see a pattern. Whose sense of style do you like? What colours are you drawn to? What type of clothes are they wearing? One mistake I made was saving lots of images of people in evening wear, when I don't have an occasion to wear full length ball gowns.
Set yourself a budget and think about cost per wear of each item you would like to buy. It's unrealistic for most of us to dress like Olivia Palermo, the Duchess of Cambridge or Kendall Jenner every day. Write down your wish list of clothes you would like to buy.
Using eBay and Etsy
The two best sites for finding affordable celebrity inspired fashion are eBay and Etsy. Start with a search on your celebrities' name. Then try different combinations of search terms like 'replica', 'look for less', 'as seen on', as seen on tv' and 'cosplay'. I used to like the phrase 'celebrity inspired' until one of the shop owners used it to list all her Bollywood dresses. You may need to get creative with the search terms you use, for example 'kate middleton' is still being used by some people who don't know her correct title is 'Duchess of Cambridge' and that she likes to be called the more formal Catherine. If the person is an actor search under the name of the television series, they starred in. If you find what you want, make sure you favourite the item and save the search.
Be careful when ordering online to select the right size. Asian based shops tend to list large as an Australian small. It's best to know your exact numbers using a tape measure, and compare them with the item of clothing. If the item doesn't list them then send the shop owner a message and ask for them.
Great websites for inspiration
Some of my favourite websites which do all the hard work for you are