If you don't have a minecraft account, you must make one first. Then go to Minecraft.net and sign in. Then click on Profile up at the top. It should have an option to change your skin, and also an option to download the reference skin.
**NOTE You need to have purchased the full version of Minecraft to have access to skins.
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download the reference skin after logging in and clicking 'profile' then edit with your preferred image editor keeping the same dimensions
For Minecraft?
Google a Minecraft skin website, like the skindex, and then you can browse the different skins in it, and download one that pleases you. Then, you go on minecraft.net and go to your profile, and upload your skin.
You can change your minecraft clothes if you change your skin or download a mod.
gotta get iexplorer to do that download it for free then download a skin then overwrite the char file