I am in a situation where a flatmate (couple) walked out without paying significant rent and left wardrobes full of clothes, suits, bags, belts etc and the majority are designer jeans and jackets etc. Wanting to recoup the rent, I'd like to sell them to a 2nd hand store if possible. Any suggestions?

Look in any Thai market on a Sunday. Stalls everywhere selling stuff like that. If you dont want to set up a stall perhaps one of the others will buy the lot from you but you wont get much either way. Could always try Ebay though at least you'll get a better return.

Just a suggestion.

If the OP is in Chiang Mai, he could get a table at the JJ Market Christmas Shopping Fair. There will be a large section of second-hand goods; good clothing is especially popular with the Thai people who have come to this fair in the past when it was called the City Life Garden Party and held on the grounds of City Life magazine. This is a fair to benefit the charities of the Royal British Legion and Lanna Care Net. They raise their funds at this fair thru auctions, raffles, games and the sale of water, soft drinks and beer to the crowd.

Here are details:

http://www.lannacarenet.org/christmas-shopping-fair/

departure lounge @ BK hilton ,

apperance is very important at de-portation.

i should know.

There is a Japanese 2nd hand store near the entrance to Sukhumvit 39. I doubt I am allowed to open a stall in a market