Tip #1: Although some airlines still allow you to check two bags per person plus allow you a carry-on, many airlines are now charging to check your bags. Always check with your airline for their regulations regarding the number and size of the bags you are required to carry. With this information you will be able to plan your wardrobe carefully.
Tip #2: Make a list of all the activities and events you plan to do and then make a list of the clothing you need to wear for those activities. Now go over the list and eliminate anything you really don't need.
Tip #3: The best way to plan your wardrobe is to mix and match basics, planning the wardrobe around one or two basic colors. For dress, men can pack two suits for an extended trip matching them up with different shirts and ties. A charcoal gray or tan suit will mix and match with just about any color. Women can mix and match the same way with black, gray, or tan jackets, skirts and pants. In either case, a change of tie or scarf with a different colored shirt will make another outfit.
Tip #4: Casual clothing depends upon where you are going. Do not assume that jeans are appropriate casual wear. In many countries, jeans are frowned upon. Khaki pants, however are usually acceptable. Additionally, jeans are heavier and bulkier than khakis. In many parts of the world, shorts are considered inappropriate as are any clothing that has a military look. It is better to err on the side of conservatism. When it comes to casual clothing, layering is a much better scheme than packing bulky, heavy clothing. Layering your clothes also gives you more opportunity to mix and match outfits. A turtleneck under a sports jacket will give a much different look than wearing it under a sweater. Always bring a bathing suit. You never know when a hotel will have a pool. For men, a conservative bathing suit can also do double-duty as a pair of shorts. For women, a bikini can do double duty as underwear. One warning, though: two-piece bathing suits may not be acceptable in all countries.
Tip #5: Knits and textured fabrics travel better than natural fabrics that have a tendency to wrinkle. Synthetics don't wrinkle as much but can be very uncomfortable in hot humid climates. A blend of natural and synthetics can be a good compromise. However, undergarments should be made of natural fabrics because they breathe easier. Also, you can bring fewer undergarments and wash them out at night. If you do opt for washing out your socks and underwear be aware that cotton takes a long time to dry. Try silk undergarments. Not only do they dry quickly, they breathe well and feel good against the skin.
Tip #6: Consider not bringing much clothing at all. Buying clothing at your destination can often be less expensive than buying it at home... unless you are staying in a resort area.