Yellow stains in my pants? sweat?

Normally after a long day or a night out when i come home i notice big yellow stains down one side of my pants. I dont think its discharge cause its not in that area. I wear quite a lot of layers (pants, tights, hold in briefs, skirt) so i think it might be sweat? incase it is discharge it dosent match anything on the NHS website it seems watery not thick or white i did have thrush i couple of weeks ago but it went away on its own so i never bothered to get it treated. Anyone else have this experience or know what it could be?

[DiacareLab]

Could be sweat

[mrskhalil]

I think it may b da thrush again