Click, or use the <Space> key to switch the costume! I recommend that you DO NOT use this because this is SUPER old art but if you want to make something quick and easy, then go ahead!
If you were wondering (probably not) this took me 30 minutes. Thanks to scratch bitmap so I can make this, (I would usually use a drawing app). Thanks to me @autumnwolf350 for making this! And thanks to somebody (I forgot who) that I copied the zoom in for.