@ShadowYin-Yang, yeah - and to a more extreme degree if you really, really go at it. I would talk to a doctor, because there's more than just fat in them.
@Chaletica, I wouldn't think it would be "worth it". The kind of fabric you can stretch will not really compress you very much unless you use a bunch of layers - and it's going to cost a bit to get all that, it will be bulkier and less for comfortable.
If you absolutely couldn't order a binder - sure, it might do something, but I wouldn't expect it to be any more effective than a sports' bra - if anything, the fabric you'd be getting would probably be *less* effective.