Girls younger than 16 could be banned from working as models at the next London Fashion Week in September.
The size of models used was in the news during London Fashion Week in February, because people were worried some models were a bad influence on young people.
Experts thought if people saw really thin models they might try to copy them, which may not be healthy.
Now a group set up by British fashion bosses has said younger models shouldn't be used on the catwalk.
Really skinny models - sometimes called size zero - have been banned in some countries, including Italy and Spain.
Size zero is the smallest clothes size in the US, and is the same as a UK size four.
At the moment girls in the UK won't be stopped from modelling just because of their size or weight, even though some people think that should happen.
It looks likely models younger than 16 will be banned though, as fashion bosses have said they will go along with the group's recommendations.