To begin creating a minimal wardrobe you first need to spring clean your old one. Do this regularly (and ruthlessly) to make sure you're not overlooking anything or hoarding items you never wear.
Five Steps To Editing A Wardrobe1 | Empty: Take everything out and start sorting into two ('to stay' and 'to go') piles
2 | Analyse: Try everything on, be honest and be critical; define your style
3 | Organise: Identify basics and establish outfits; organise the space so clothing can be found easily
4 | Modify: Isolate items that need fixing and make the repairs (or be prepared to get rid of the item)
5 | Say Goodbye: Be ruthless; keep only items that make you look and feel good
Questions To Ask Yourself1 | Do I wear this regularly? If not, why?
2 | Does this item fit into my overall style?
3 | Can I create various outfits with this one item?
4 | Is it comfortable and flattering? Do I feel good wearing it?
5 | Do I love wearing this item or do I just like the way it looks on the hanger?
Only keep what you enjoy wearing, what is in good condition, and what makes you feel comfortable. If you haven't worn something in six months you probably don't really like it all that much and since the goal is to own only pieces of clothing that you wear regularly and love, then it's wise to get rid of anything unworn.