Can you recommend any good BJD clothing patterns?

You might want to check out Japanese BJD enthusiast patterns. There’s an older set that’s pretty decent, and the sizes are based on Volks’ patterns. If you can’t find that, just browse the internet. For beginners, DIY is really just about trying it out. If you find it enjoyable, you can continue investing in more supplies. Don’t overcommit right away, as it can be time-consuming, and you might lose interest halfway through.