In the afternoon and evenings most people's feet are a bit bigger. Best not to buy shoes in the morning when your feet are smallest,or they may be too tight later in the day....the reason is that while you're lying in bed,the fluid return works a bit better than when you're standing up,(it isn't going uphill) so as the day goes on there is more fluid in your feet and they are swollen a bit. For some people it's very noticable,for others hardly at all. Depends on how well your venous and lymphatic systems are working,general fitness,various medical conditions,all sorts. People are a bit shorter in the evenings than in the mornings too,because of the gravity pulling downwards through your spine and all the supporting bits are working against it,whereas at night while you're horizontal,the gravity is at right angles to the spine,and you get a bit longer...only 1/8th of an inch or so,nothing to worry about. ......Oh dear,Sophia...maybe have a little think about that eh? When are you going to wear the shoes?.