Don't get on the bed with your clothes that you were wearing outside.
ーDon't get on the bed with your dirty clothes on.
「汚い洋服のままベッドの上に上がらないで。」
get on the bed で「ベッドに上がる」
with your dirty clothes on は「汚れた服を着たままで」というニュアンスです。
ーDon't get on the bed with your clothes that you were wearing outside.
「外で着ていた服のままベッドに上がらないで。」
clothes that you were wearing outside で「外で着ていた服」
ご参考まで！
カナダ 
