I really don't think you will like the result. It has been discussed here before.
It has been tried with terrible results.
I remember one member who wanted to do this on the aprons of a Kilt he was making and ended up throwing the entire thing out.

The fusing of two fabrics together negates the fabrics ability to move and swish. It will cause it to develop large unsightly wrinkles.

Please, do yourself a favor and find some good fabric to start with.

The cost to you in the end will be negligible. For example let's say the 7oz fabric you found sells for $4.99 per yard. If you buy 4 yards you spend $19.96.
If you find a good, high quality fabric and it sells for let's say $10.00 per yard you would spend $40.00 for it. The difference in the two fabrics is like night and day when you make the Kilt but the actual difference in the cost of the fabric is only $20.04. Or 8 cups of coffee.

That seems like a no-brainer to me.