Clothing is designed to provide privacy and modesty, so it is impossible to see through. No matter the technology or device, there is no way to see through articles of clothing. Unfortunately, there is no way to see through clothes.
The only realistic way to make a person’s clothes appear to be see through would be to use special effects, or to digitally alter the image in some way. While there are various photo editing tools and apps to help change the appearance of clothes, or add different elements like backgrounds, text, effects and filters, there is no app that can take a clothed person and make them appear see through. No, there is not an app to make clothes see through.