My general rule of thumb for packing:
1) Make sure you really need an item before it goes in your suitcase,
2) Reconsider again whether you really need an item before it goes in your suitcase,
3) If it is worth packing at all, bring enough for the entire length of your trip. Don’t plan on “buying more when I get there” for anything of real importance.
As a result of these self-imposed packing rules, I may pack lighter on the clothes and shoes, but heavier on the creature comforts and nice-to-haves. I would be far more likely to eliminate an entire outfit than travel to far-flung destinations without my favorite tea to drink each morning. This has worked for me over 25+ years of traveling. Try it--you might like that comfortable feeling, too.