I just bought shoes using an online store for the first time. Buying clothes or shoes online can be a terrible way of buying things since you can’t try on the items beforehand. In my case, I bought a pair of Converse shoes. I have several pairs of Converse at home, which made me somewhat confident that I know what size will fit me. Still, you never know as every different model might be slightly different.
I salute every brave person who buys a shirt or a pair of pants without trying them on first. Those people must know exactly what they’re doing.