Is there any basis in the Prophetic Sunnah for preferring to travel, wash clothes, shave hair, or cut nails on specific days, and claiming blessedness for some of them? And is the hadith "Whoever buys a spun garment" authentic?

Travel is permissible on all days and at all times, but it is preferable to travel at the beginning of Thursday, as it is reported that the Prophet, peace and blessings be upon him, often departed for his journeys on Thursdays. There is no specific day or time for washing clothes, shaving hair, or clipping nails; a Muslim should do these whenever needed. As for the term "thawb masboot," it is not found in the books of Sunnah (definition), and "al-masboot" refers to one who is dead or unconscious.