Bigger/Larger Men's Clothing

I am doing a project at university for my final year which i need to collect so information on for a bigger men's clothing line and was wondering if anyone could answer some questions i have...

1) Where do you shop for clothes now?

2) Do you think there are enough brands catering to plus size men's
clothing?

3) What do you look for when buying clothes? eg. fabric, cut, colour

4) What type of clothing do you find hardest to find? eg. formal, casual,
outerwear

Thanks :)

Is this only for "Bigger/Larger" men to answer only?