There are many ways of making clothes in Second Life, and a lot of different styles of clothes that avatars can wear. A lot of it is very complicated and there are tutorials out there to help you if you want to learn the complicated party of clothes making. For now I will just go over the basics of clothes making, and by basic, I mean you don’t have to use GIMP or Photoshop to do it.
1) To start your outfit off Right click your avatar and select Edit Out.
5) You can also change the colour of the pants, from the Color/tint menu. Here I have chosen a black colour but you can choose what ever you want from the menu provided for you.
That is the basics behind making clothes in Second Life, but if you are interested in making clothes a lot more complicated and stylish it is worth visiting clothes making classes in Second Life, as well as searching Youtube for other tutorials.