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Lining the whole top with interfacing is going to work against the natural beauty of the fabric and negate the nice clinginess and stretch.
You can just use patches of interfacing behind parts where you bead. That is, the fabric is sandwiched between the interfacing and the embellishments. If the embellishments are large, this method can be more problematic and create puckering.
You can also bead onto the stretch velvet while it is stretched to simulate how it will pull when on your body. Use strong thread with loose stitches and knot well. Dress forms make this a bit easier.
The rhinestone strings can be anchored with small circles of interfacing. If you plan to have large widths of fringe, it may be better to make a separate belt because of the weight.
Try taking a look inside professionally made costumes the next time you have a chance. May give you some ideas.
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