immodesty is...insecurity?

I just listened to this short thought by John Piper on the topic of modesty, and posted this little (okay, lengthy) dissertation on a thought that I had on Facebook, and I thought I'd share with you all:

Before we can even DISCUSS the guidelines and boundaries of modesty, you must understand just how absolutely, totally, and truly you are loved by Jesus...is He your treasure? Is He your pursuit of happiness and joy? Do you really, truly, honestly realize what a treasure you are to Him? Is it Him you're looking to please, or others?

Girls, you are worth so much more. Modesty isn't just an attitude or a way of dressing, it's realizing your IDENTITY. It's realizing that you are SO MUCH MORE than how you appear on the outside. You are the daughter of the King. You were redeemed by His blood. You don't need to dress any certain way to be accepted or approved by anyone in this world. It starts with Him. Once your heart is His, from it will flow the love for others that will cause you to dress for His glory...whatever the boundaries may be that He will reveal to you.

I notice an epidemic of 'modest dressers' whose clothes cover, but their hearts are yearning for acceptance and attention. They may dress modestly for the sake of their parents, their peers, their church...all for the sake of being accepted and feeling like they belong. What then, is it still modesty? This is the evil root of the enemy, putting emphasis on the outward appearance, even within 'modest' Christian circles. It's no longer modesty. Though the clothes cover, it is immodesty at it's root--insecurity and vanity; idolatry, replacing the acceptance of God with men.

Modesty roots in the heart, knowing your place in the Kingdom of God. You are a princess. You are dressed proper. Lift your head, smile wide, breath deep, and realize your inexplicable worth to Him. He loves YOU. Yes, YOU, sweet girl.

‪#‎modesty‬ ‪#‎identityinChrist‬ ‪#‎worthsomuchmore‬ ‪#‎dressedbyHim‬

I know this is a bit of a hot topic this time of year (haha, no pun intended ;P), and I'd love to hear your thoughts on the above.

What do you think about Piper's position?

What do you think of the idea that immodesty is insecurity at it's core?