Does prayer become invalid by wearing clothes that have holes revealing the minor or major nakedness, knowing that this is the case? And does the forgiveness of Sheikh al-Islam for a small amount of nakedness and impurity include the case of knowing about the slight exposure before prayer?

If someone prays knowing that a part of their awrah (private parts) is uncovered, even a small amount, their prayer is invalid and must be repeated. This is the ruling given in fatwas. Some jurists are of the opinion that the prayer is not invalidated by a small amount of awrah being uncovered intentionally, but the first opinion is the most correct one within the Hanbali school of thought. Therefore, intentionally uncovering a small amount of the awrah invalidates the prayer.