My bedroom does not have a closet!

If you have an open corner perhaps you could build one that goes around the corner and out a bit from the sides.

fyi in most parts of the country, a bedroom isn't a bedroom unless there is a closet. its not hard to put in a closet. However, you did say what was the "Easiest". So check out portable closets. It's a self contained closet, normally made from metal framing covered by vinyl/ plastic, Som have a zipper or Velcro. Also you could just put up a closet bar (rod) diagnally in a corner of the room, if you want it hidden, hang a sheet from a curtain rod at the ceiling about 14 inches in front of the closet rod.

If you have open space beneath your bed you can build pull out drawers that fit under the bed.

Hmmm. This actually sounds like fun. Pick an area in the room for your closet. Measure it and go to your Home Store. There you will find a variety of closet ideas - for both storage and hanging clothing. Choose pieces that fit your space. Now all you need is a way to "hide" your "closet". You could use curtain rods attached to the ceiling and hang tabbed curtains from it - that's pretty easy and inexpensive. With a bigger budget and more space you could use screens or sliding panels (think IKEA)

You can find a nice armoire at thrift store or yard sale. For hanging space you can add a curtain rod inside.

There are several ways: buy an armoire; use a portable clothing rack; hang drapery rods that are at least the width of the normal-sized hanger and use them as closet bars. If the clothes are visible in the room, there is real incentive to not only pare down the amount of clothes, but incentive to keep them hung neatly and creatively.

How big is your room? You can create a "dressing area" behind the bed (or anywhere you have room like the photo.) by using spring tension rods, bookshelves, bookcases, hanging boxes/baskets, etc.

How about using under the bed storage bags or a bed that has a storage feature as part of its design.

How high is the ceiling? I am wondering if mounting a hanging rack from the ceiling might be an option for you. Here are a couple of examples: