I made this top with high-waisted shorts/pants/skirts in mind, so it hits right above my waist. It's up to you how long or short you'd like your top to be.
If you decide to make this, you MUST make sure that you're able to put on (and take off!!) the bra without disconnecting the straps. There aren't any zippers in this project, although you're more than welcome to add one in if you know how to do so, even with the bra involved. This might be a tight squeeze (and you might look a little funny putting it on) but I did it in the interest of making it as simple as possible, and a way to repurpose a bra that you might not use often.
(EDIT 6/12: Check the comments for an awesome suggestion by rhelm_2: "To make it easier to get off and on, you could do step seven first and instead of sewing all the way up to the top on this step, only sew until the last inch or two. You could leave a little peep-hole type thing by sewing the edges of the bra to the edges of the fabric so you could clasp it together instead of wrestling it on")
Since this doesn't use a pattern, little things will vary for everyone, so here's a general run thorugh of how I did it. Let me know if you have any questions! xo