My ds (3 in feb) has been doing well on potty at home as long as naked or just in pants, but get fully clothed and most of time he will just go in pants and he isn't really getting to grips with doing in when out. When out I will take him to toilet and try and keep asking him if wants to go but says no and then goes in pushchair. Feel he is displaying his stubborn streak. Any tips to suggest moving him forward?