If you happened to be a Cistercian monk, then the clothing was just a woollen habit reaching to the ankles, with a hooded cloak or a hooded cape (the cowl), all made of natural, undyed wool. Sleeves were deliberately made very wide and far too long, so they had to be turned back or bunched up the arm. When allowed to fall to full length these sleeves completely hid the hands. No underwear was allowed and the shoes would be the normal leather turnshoes of the time.
Benedictine and Cluniac monks wore the same, but in black wool. They were permitted to have a long linen shirt underneath and if they were sent outside the monastery on some errand they were permitted not only to borrow a good-quality habit and cowl from the cellarer, but also a pair of linen braies (long, baggy underpants) which had to be washed and put back into the stores on their return.
Carthusian monks also wore undyed woollen habits, over very coarse hair shirts intended to make the skin sore (the Carthusians were perhaps the most extreme of all the orders of monks).
No crosses were worn, no sandals and no knotted rope belts - these were all marks of the Friars, who were not the same as monks.
See links below for images:
robes
Monks
it actually helped the monks achieve zen
work
by monks in middle ages
There were lots and lots of monks in the Middle Ages. Nuns, too. Roger Bacon was a famous monk of the period, and Hildegard of Bingen was a famous nun.
In an nunnery. Monks lived in Monerstrys.
It was used in the middle ages by monks!
They lived in monasteries
The monks
because they were not treated with respect.
Generally, the monks were the ones who were the apothecary's .