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The obvious clothing shops to buy from are charity shops.
I find it is better to avoid the ones with the posh old ladies serving you.
Also, go to places like Camden town.
All the drag queens go there and you often see guys leafing through the ballgowns.
No one turns a hair.
Whatever you do, wigs or dresses, never go in drag.
You will look ridiculous unless you are 100% convincing or it is gay pride day outside.
Also buy online and through catalogs, you never need to leave the house then.
Finally, buy a sewing machine, you can buy any fabrics without anyone looking twice, and the outfits will fit you properly.