「たり」in ～たりする is a particle used as an adverb. It takes one action or state as an example, implying that there are other similar things.
Today I've spent the whole day watching TV.
(Watching TV was all she did.)
Today I've spent the whole day watching TV and such. ... watching TV and the like, ... watching TV., etc.
(Maybe she played computer games? read manga? etc., besides watching TV)
The sentences you mentioned may be translated as follows:
Are you going somewhere fancy, wearing kimono and such?
Are you going somewhere fancy, being dressed up, like wearing kimono?
Please don't talk loudly, etc.
Please don't talk loudly (and do other disturbing things).
Please refrain from making noise, like talking so loudly.