Notice what the texts says rend your heart singular and not your garments plural.

In other words all it takes is one action with your heart to get right with God. 

While you make change your garment many times and still not get it right!

What is Sin: Knowing to, and not doing good: James 4:17

Spots that cannot be removed: II Peter 2:13

Burdens that man cannot lift: Isaiah 1:4

Rend your heart: 

Psalms: 34:18 The Lord is nigh unto them that are of a broken heart; and saveth such as be of a contrite spirit. KJV

Psalms 51:17 The sacrifices of God are a broken spirit: a broken and a contrite heart, O God, thou wilt not despise.