I myself am 78 atm and I'm going to start crafting them around lvls 81-82.
Arhat's Hakama doesnt actually look like that big of a loss because all the materials except for Sheep Leather can be obtained by desynthing white mitts.
Theres a vendor in lower jeuno @ the equipment shop that sells white mitts for 4830 gil each.
for desynthing white mitts you get NQ:Saruta Cottonx1 HQ1:Silk Threadx4 HQ2:Woold Threadx2 HQ3:Gold Threadx1
Use all the first silk thread you obtain to synth ALOT of Silk Cloths then either sell your wool thread(usually around 40k a stack) to buy Cotton Threads(usually 25-30k a stack) to make the Velvet Cloth with silk threads you obtain after making your silk cloths.(can also synth your saruta cotton into cotton thread.)
To make Velvet Cloths it takes Earth Crysta Silk Threadx1 Cotton Threadx2
OR
Earth Crystal Silk Threadx1 Woold Threadx2
Either way, you can use the saruta cotton & Wool threads you obtain to make the velvet cloths, and SELL ALL the gold thread you get to break-even/profit. On alexander server atm(3-1-06) a stack of Gold Threads sell for 600k which isnt that bad considering it costs way LESS than 600k to obtain a stack through desynthing! :)
Desynthing White Mitts was a very bad idea, there is practically a 50% or greater failure rate, even with 10-15 tarutaru stools(lightning++) and moghancement desynthesis I took a huge loss attempting this. Just wanted to let everyone that this is not a good idea and you will take a loss doing this ( i desynth about 20-40k worth of mitts for a few pieces of silk and cotton, and maybe a gold thread if im lucky) huge loss.
just hit 88 cc and can finaly stop making these...for any of you weavers that are about to start...dsynth each one...i got a **** load of silk back from doing it sometimes 8 at a time! was even lucky enough to hq one while skilling up...helped pay for a level or 2..good luck