There is a recent IRS tax change effective last year. I remember hearing about it and looked it up. Here is the wording on clothing donations from the IRS site irs.gov
"For all donations of property, including clothing and household items, get from the charity, if possible, a receipt that includes a description of the donated property. If a donation is left at a charity’s unattended drop site, keep a written record of the donation that includes a description of the property and its condition."
Thinner is better...........