Clothing has no effect on whether or not you have to spend time in Purgatory. You will have no need for clothing anyway as you will be a pure spirit.
Purgatory.
You don't need purgatory. Purgatory is a made-up place created by the Catholics in the earlier centuries, to get the church out of debt. Research the origin of purgatory to find out more. I concur. Next question please.
No
can Catholics wear the sign of David Cross?
No, we just figure they are trying to repeal vampires. Besides Catholics don't usually wear crosses, usually, they wear crucifixes.
Purgatory Masks
No. Many Catholics wear a cross on their rosaries, but most Christians do not wear a cross at all.
"Believe in" is not quite right. Purgatory as a place was never an official, promulgated teaching of the church. In 1999 Pope John Paul II declared that the term Purgatory does not indicate a place, but "a condition of existence". See link for everything you ever wanted to know (and then some) about Purgatory. The article discusses the positions of many other churches.
To stay out of purgatory, Catholics paid an "indulgence". Indulgences reduced time in Purgatory for sins that are already forgiven, they didn't necessarily keep you completely out of Purgatory. Also, the giving of money [meant as alms for the poor, but at one point was taken by the clergy (even then it wasn't an approved practice and was considered Simony)] to receive an Indulgence was stopped by Pope Pius V in 1567.
Catholics believe the pope is the vicar of Christ on earth, Lutherans do not. Catholics believe they are saved by faith and good works. Lutherans believe they are saved by faith alone. Catholics believe in Purgatory, Lutherans do not.
Catholics believe that souls in purgatory are purified of their sinful attachments before entering heaven. They are cleansed of all venial (less serious sins which did not rate them in hell) as "There shall not enter into it any thing defiled, or that worketh abomination or maketh a lie, but they that are written in the book of life of the Lamb." Apocalypse (Revelation) 21:27.
For Catholics they call it the 'purgatory' which is essentially the border line/ waiting room before entering Heaven and/or Hell. Therefore if you've committed bad deeds you could repent for them and live on doing good so that you could enter heaven.