As many as you wear regularly, there isn’t a specific number you should aim for. The problem is not if you have more clothes but too many that you don’t wear and WRONG ones for your current lifestyle. The number will be specific to you, your lifestyle, your preferences, etc. How often you can wash your clothes is one of the most significant factors in deciding how many items you need. If you do laundry once a week, that means you will need enough clothing to last seven days, so about a week’s worth of clothing (for hot weather or/and cold-weather – depending on your climate). The next big factor is how often you wear something. For example, you can wear jeans multiple times before washing. But if you wear a new t-shirt every day of the week, that’s 7 t-shirts. Again, always consider your lifestyle needs and personal preferences.