Let me introduce myself first . I'm a stylist, photographer and personal shopper . I'm learning to make clothes and when I saw this realistic squished effect I decided to figure out how to get it done. 

I'll really help  with your avi look and take you a stunning profile pic if you help me with this. 

I only was told it was a BOM effect, but ,what do I have to do ?

Thank you in advance guys 

you post this in a share forum, so i move your question to the right forum, 
to introduce yourself is normal in another forum
so best is for you read step 1-6 

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thats are the rules and helps

That is not BOM effect,since BOM jsut bakes textures,and don't manipulate mesh.It looks like a body that has addons for it to give different looks,or specialty uploaded ones.If you could share source of the images,or edited body to see maker/name of body could help figure it out.

 

Thank you for your fast answer. This is the original image 

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It's yentements body.Has the mesh made like that.