trial bra
bias tunnel
bra back
Use a foam lining or some other non-stretch fabric as a cup material.
Bra band can be made of a cotton fabric or similar.
Cut the bra band wings much longer than marked on the pattern at centre back.
Use a bias binding as an underwire casing material.
Pin the strap elastics in place and tie bra band wings as a bow. Don’t tie too tight as this will ruin the shape of cups.
And voilà, your trial version is ready!
Tip for fitting a trial version: lift the straps a little by hand because the bra band made like this does not provide any support.